Liste des Tutorials Information - VAG Coding

Fix the SOS Error “Emergency Call Function Limited”

T0MS — Wed, 16 Sep 2026 22:49:52 +0000

Overview

On some VAG Group vehicles, the following message may appear on the instrument panel:

“Emergency call function limited. Workshop!” / “Emergency call function limited. Workshop!”

The SOS indicator light may also come on along with the red LED on the SOS button.

A diagnostic test using VCDS or OBDeleven can help determine the cause of the problem.

If there are faults related to the emergency call module’s backup battery, the battery must be replaced. After replacement, the battery history must be reset in the 75 – Emergency Call control unit.

Diagnostics with VCDS / OBDeleven

Connect VCDS or OBDeleven to the vehicle and turn on the ignition.

From the main menu, select:

75 – Emergency Call / 75 – Telematics

Then:

Error Codes – 02

Retrieve the stored error codes.

Signs that a backup battery may be reaching the end of its service life

The following issues may occur:

1644784 – Backup Battery
B1916 F2 [00001001] – Used/Worn Out
Backup Battery – Flat

or:

1644276 – Backup Battery
B1916 F4 [00001001] – Critical service life
Backup Battery – Limited Service Life

These faults indicate that the emergency call module’s backup battery has reached the end of its service life.

Important: The mere appearance of the SOS message does not necessarily mean that the battery needs to be replaced. Always run a diagnostic check on control unit 75 – Emergency Call before replacing the battery.

Replacing the backup battery

If the diagnosis confirms faults B1916 F2 and/or B1916 F4 related to the backup battery, the battery must be replaced.

SOS module backup battery, part no.: 3G0915089

The replacement battery is available from VAG Custom:

Backup battery for SOS emergency call module

VAG Custom – SOS Module Backup Battery

Batterie fonction secours Module SOS 3G0915089

After replacing the battery, follow the procedure below to reset the history stored in the control unit.

Reset the Battery History with VCDS

After replacing the battery, reconnect VCDS to the vehicle.

Proceed :
1 – Engine off, ignition off, connect your official VAG-COM VCDS cable to the computer, then plug the other end into your vehicle’s diagnostics socket.

2 – Switch on the ignition and run the VCDS program.

3 – Click “Select,” then click “75 – Emergency Call” / “75 – Telematics“

4 – Click “Adaptation – 10.”

5 – On this page, at the very top, there is a drop-down menu.
In this drop-down menu, select ” Reset the history of the emergency call battery ” / ” Resetting the history of the emergency call battery “

6 – Select this function.

7 – Start the basic setup and wait for the process to complete.

This procedure resets the history of the previous battery stored in the 75 control unit.

Reset the battery history with OBDeleven

After replacing the backup battery, connect OBDeleven to the vehicle and turn on the ignition.

Open calculator 75 – Emergency Call.
Go to Basic settings.
Search for the function:

Resetting the emergency call battery history

Select the function, then start the basic setup.
Wait until the procedure is complete.
Return to Calculator 75 – Emergency Call.
Read the fault codes and clear the faults related to the old battery.

Clear the error codes

Once the reset is complete, go back to:

[Error Codes – 02]

Perform a new error check.

If the previous errors are still present, select:

[Clear Codes – 05]

Delete the recorded defects.

Next, turn off the ignition and then turn it back on.

Run a new diagnostic test on module 75—Emergency Call —to verify that the battery-related faults do not recur.

Result

After replacing the battery and resetting its history, the emergency call system should return to normal operation.

The message:

“Limited emergency call feature. Service!”

should disappear from the dashboard.

The SOS indicator should also return to normal operation with the green LED.

Affected Vehicles

This procedure applies in particular to models equipped with the emergency call system and the 75 control module – Emergency Call:

Audi

A1/S1 GB — 2019-
A3 Sedan/Sportback 8Y — 2020–
Q2 GA — 2017-
Q3 F3 Sportback — 2019–
Q4 e-tron 89A/F4 — 2022-
RSQ3 F3 Sportback — 2020-

SEAT

Arona KJ — 2018–
Ateca KH — 2016–
Ibiza KJ — 2018–
Leon 5FA/KL — 2020-
Formentor 5F/KM — 2021-
Tavascan 11 a.m. — 2024-

CUPRA

Born 10E — 2022-
Formentor 5F/KM — 2021-
Tavascan 11 a.m. — 2024-

Škoda

Elroq 5A — 2021-
Enyaq 5A — 2021-
Fabia PJ — 2022- — Sedan/Station Wagon
Kamiq NW — 2019–
Karoq ND — 2018-
Kodiaq NV — 2018–
Kushaq 6JM/PA — 2021-
Octavia NN — 2020-
Rapid NH — 2013–2022
Scala NW — 2019-

Volkswagen

Arteon 3H — 2017–
Atlas Cross Sport CM — 2020–2023
Caddy — 2021–
Caddy SB — 2021-
Crafter SC/SZ — 2017–
Golf 7 7.5 5G— 2017–2020
Golf 8 5-Door — 2020-
ID.3 E1 — 2020-
ID.4/ID.5 E2 — 2021-
ID. Buzz EB — 2023—
Jetta/Syncro BU — 2020–2022
Passat 3G — 2018–2024
Passat A3 — 2015–2022
Polo Coupé AE — 2018–
Polo Sedan/Classic/Notchback/Variant AW — 2018–
Polo Sedan/Classic/Notchback/Variant CK — 2020–
T-Cross C1 — 2019-
T-Roc A1/AC — 2018-
T-Roc Cabrio — 2020-
Taigo CS — 2022-
Taos CP — 2021–2023
Teramont CA — 2018–2024
Tiguan Allspace BW — 2018–
Tiguan AD/BT — 2016–2024
Touran 5T — 2016–
T5 Multivan SH/SJ — 2020–
Transporter/Caravelle SH/SJ — 2020–

Compatibility

The fact that a vehicle appears on this list does not, in and of itself, guarantee that the procedure will be available. Check for the presence of the 75 – Emergency Call module and the basic settings function using VCDS / OBDeleven.

Fix Error 1555 / B201A: Check the software version management

T0MS — Mon, 07 Sep 2026 13:16:59 +0000

MIB2 Code Calculator

Present Value

Please enter a valid hexadecimal value.

New code

DTC 1555 / B201A – Check Software Version Management

This tutorial explains how to generate the code needed to address DTC 1555 / B201A – Check Software Version Management on MIB2 systems.

This issue may occur, for example, after certain operations performed on the MIB2 infotainment system, such as a firmware update.

Proceed :
1 – Engine off, ignition off, connect your official VAG-COM VCDS cable to the computer, then plug the other end into your vehicle’s diagnostic socket or OBDeleven box.

2 – Switch on the ignition and run the VCDS program or the OBDeleven application.

3 – Click on“Select” then click on“5F – Electr. information”.

4 – Click on“Security Access – 16” then enter the code“20103”.

5 – Click on“Adaptation – 10”.

6 – On this page, at the very top, there is a drop-down menu.
In this drop-down menu, select ” Confirmation of installation change “

7 – Note the value currently displayed.

Example: 40 C3

8 – Calculate the new code

Use the MIB2 code calculator above.

Enter the value you recorded in the ” Confirmation of Installation Change” field, then click ” Calculate Code.”

9 – Enter the new code

Go back to:

5F – Information Electronics → Adaptation → Confirmation of Installation Change

Replace the current value with the code obtained from the calculator.

Then confirm the change.

10 – Clear the error

Read the error codes from the 5F control module (Information Electronics) again.

The defect:

1555 / B201A – Check Software Version Management

can then be deleted.

Clear the errors, then run the scan again to make sure the error does not reappear.

Warning:

After saving the new code, the value displayed in the “Confirmation of installation change” channel remains unchanged. It is therefore normal for the old code to still be displayed after confirmation.

The change is nevertheless taken into account by the computer. Do not repeat the procedure simply because the displayed value has not changed.

Instead , check to see if error 1555 / B201A – Check Software Version Management can now be cleared.

This procedure is intended for MIB2 systems affected by error 1555 / B201A.

The menus and customization options may vary depending on the vehicle model, multimedia system version, and firmware version.

Always note the original value before making any changes.

Enabling the Hidden Menu for Audi MMI 3G and 3G+

T0MS — Mon, 17 Aug 2026 12:58:47 +0000

Complete procedure for activating the Hidden Menu (Green Menu) on the AUDI MMi 3G and 3G+ without using VCDS or OBDeleven!

Vehicles affected include, in particular:

Audi A1 — 2011–2018
Audi A4 — 2013–2017
Audi A5 — 2009–2018
Audi Q3 — 2015–2019
Audi Q5 — 2013–2018
Audi Q7 — 2013–2018
Audi A6 — 2012–2016
Audi A7 — 2012–2016
Audi A8 — 2011–2019

–> Check out the tutorials titled “Enable Hidden MMI Menu…” using VCDS for each Audi model

–> To access the Audi Red Engineering menu

WARNING: We are not responsible for any consequences these changes may cause… Try this at your own risk.

Start by downloading the file available for free here from VAG Custom:

Activation menu caché pour Audi MMI 3G 3G+

1. Next, extract the file you just downloaded: MMI 3G 3GP Activation Hidden Menu.zip

2. Format an SD card to the FAT32 file system.

3. Copy the contents to the root directory of the SD card.

4. Start your AUDI and let the MMI boot up; this takes a few seconds.

5. Turn off Bluetooth on your smartphone if it is connected to the MMi, and remove all your SD cards (SD1 & SD2)…

6. Next, insert the SD card you prepared earlier into the SD1 slot.

7. You’ll see green text asking you to turn the large dial on your MMi center console; the message will then disappear.

8. Wait a few moments. A new message will appear stating that everything went well and that the hidden menu has been successfully enabled.

9. Restart the MMi using the button combination specific to your Audi.

Source: idevx

L’article Enabling the Hidden Menu for Audi MMI 3G and 3G+ est apparu en premier sur VAG Coding.

Access the Audi Red Engineering menu

T0MS — Mon, 17 Aug 2026 11:21:49 +0000

Audi – How do I access the Red Engineering Menu?

The Red Engineering Menu, also known as the Red Engineering Menu (REM) or Engineering Menu, is a hidden technical menu found on various generations of Audi multimedia systems.

In particular, it allows you to view detailed information about the multimedia system, its software and hardware versions, and various technical features.

The method for accessing the red Engineering menu depends on the generation and exact part number of the MMI.

Warning: Some of the functions in this menu are intended for technical operations. Do not change any settings unless you know exactly what they do.

How do you identify your MMI?

Before following these steps, it is important to correctly identify the multimedia system installed in your Audi.

The simplest way is to check the system’s version information.

Depending on the generation of your MMI, you may find the following part numbers, among others:

MMI Model	Software Version	Generation
MMI 2G High	SW: XX-XX XX.X.X XXXX	2005–2008
MMI 3G Low/Basic	BNav_EU_XXXXX	2008–2016
MMI 3G High	HNav_EU_XXXXX	2008–2012
MMI 3G+	HN+_EU_XXXXX or HN+R	2012–2016
MMI RMC	RMC_EU_XXXXX	2010–2015
MMI MIB1 STD	MSTD_EU_AU_XXXXX	2012–2015
MMI MIB1 High	MHIG_EU_AU_XXXXX	2012–2015
MMI MIB2 High	MHI2_ER_AUXXX_XXXXX	2015–2019
MMI MIB2Q High	MHI2Q_ER_AUXXX_XXXXX	2015–2019
MMI MHS2	MHS2_ER_AU_PXXXX	2016–2019
MMI MH2P	MH2P_ER_AU_PXXXX	2019 +
MMI MHI3	MHI3_EU_AUXXXX_PXXXX	2019 +

Below you will find the different generations of MMI, the part numbers used to identify them, and the corresponding Audi models and model years.

The model years listed correspond to the compatibility information provided for the various MMI systems. A single vehicle generation may be equipped with multiple multimedia systems depending on the model year, trim level, and equipment.

Key combinations

Once you have identified your multimedia system, the key combination used to access the red Engineering menu depends on the MMI generation.

The different combinations are shown in the image below.

In older cars (primarily those manufactured before 2016), you can use one of the keyboard shortcuts below to access the red engineering menu.

Use only the combination that corresponds to your MMI.

If you don’t know your system’s generation, refer to the various references and photos provided later in this tutorial.

MMI 2G

Reference / Software:

XX-XX XX.XX XXXX

Vehicles affected include, in particular,

Audi A4 — 2009–2010
Audi A5 — 2008–2009
Audi A6 — 2005–2009
Audi A8 — 2002–2011
Audi Q7 — 2007–2009
Audi RS6 — 2008–2011

Identify the 2G MMI

The MMI 2G is one of the first generations of Audi multimedia systems.

Check the version displayed in the system information and compare it with the image below to verify your system.

MMI 3G Basic / Low

Reference / Software:

BNav_XX_XXXXX

Vehicles affected include, in particular,

Audi A4 — 2010–2013
Audi A6 — 2009–2012
Audi Q5 — 2009–2013
Audi Q7 — 2009–2012

Identify the MMI 3G Basic / Low

The MMI 3G Basic / Low can be identified by a software version that begins with BNav_.

Compare the part number displayed on your MMI with the photo below to verify your system.

MMI 3G High

Reference / Software:

HNav_XX_XXXXX

Vehicles affected include, in particular,

Audi A4 — 2010–2013
Audi A5 — 2010–2013
Audi Q5 — 2010–2013
Audi Q7 — 2010–2013
Audi A8 — 2009–2010

Identify the MMI 3G High

The MMI 3G High typically uses a software version that begins with HNav_.

Check the version displayed in the system information and compare it with the image shown below.

MMI 3G+

Reference / Software:

HN+_XX_XXXXX

HN+R

Vehicles affected include, in particular,

Audi A1 — 2011–2018
Audi A4 — 2013–2017
Audi A5 — 2009–2018
Audi Q3 — 2015–2019
Audi Q5 — 2013–2018
Audi Q7 — 2013–2018
Audi A6 — 2012–2016
Audi A7 — 2012–2016
Audi A8 — 2011–2019

Identify the 3G+ MMI

The MMI 3G+ can be identified by the software part numbers HN+_ or HN+R.

This generation is an evolution of the MMI 3G and is featured in many Audi models from that period.

Compare your software version with the image below.

MMI RMC

Reference / Software:

RMC_XX_XXXXX

Vehicles affected include, in particular,

Audi A1 — 2010–2018
Audi A3 — 2013–2018
Audi A6 — 2011–2017
Audi A7 — 2010–2017
Audi Q3 — 2011–2018

Identify the RMC MMI

The RMC MMI can be easily identified by a software version that begins with RMC_.

Check your system’s version information and compare it with the image below.

–> MMI RMC Software Update (fixes Bluetooth issue)

Mise à jour logiciel MMI RMC Audi (RMC1-RMC2-RMC4)

MMI MIB1

Reference / Software:

MHIG_XX_XXXX

Vehicles affected include, among others,

Audi A3 — 2013–2017

Identify the MMI MIB1

In particular, the MIB1 can be identified by a software version that begins with MHIG_.

Compare your part number with the photo below to verify your system.

MMI MSTD

Reference / Software:

MSTD_XX_XXXX

Vehicles affected include, among others,

Audi A3

Identify the MMI MSTD

The MSTD is one of the systems based on the MIB architecture.

The MSTD_ software reference number is one way to identify it.

Compare your part number with the photo below to verify your system.

MMI MIB2

Reference / Software:

MHI2_XX_XXXX

Vehicles affected include, in particular,

Audi A4 — 2017–2019
Audi A6 — 2017–2019
Audi A7 — 2017–2019
Audi A8 — 2018–2019

Identify the MMI MIB2

The MIB2 can be identified, among other things, by a software reference number beginning with MHI2_.

Check the software version displayed in the system information and compare it with the image below.

MMI MIB2 High – MHI2Q

Reference / Software:

MHI2Q_XX_XXXX

Identify the MMI MHI2Q

The MHI2Q is a variant of the MIB2.

The reference MHI2Q_ is used to identify it in the version information.

Compare your part number with the photo below to verify your system.

MMI MIB2 – MHS2

Reference / Software:

MHS2_XX_XXX

Identify the MHS2 MMI

Some MIB2 units use the MHS2_ prefix.

Checking the software version confirms the system generation before running the procedure.

Compare your part number with the photo below to verify your system.

MMI MIB2 – MH2p

Reference / Software:

MH2p_XX_XXX

Identify the MH2p MMI

Units with the MH2p_ designation belong to a different generation of MIB2 units.

As with other systems, always check the reference number listed in the version information before following the procedure.

Compare your part number with the photo below to verify your system.

What is the red “Engineering” menu used for?

Depending on the system generation, the Red Engineering Menu provides access to various technical information and functions.

In particular, it can be used to:

check the firmware version;
view the MMI’s hardware information;
identify the various components of the system;
view certain system information;
access certain technical features;
perform certain maintenance tasks;
Review useful information before updating the system.

The available features may vary significantly from one generation of MMI to another.

Red Menu and Green Menu: What’s the Difference?

Be careful not to confuse the red Engineering menu with the hidden green menu.

The green menu provides access to various settings and hidden functions in the MMI.

The red Engineering menu is primarily intended for technical information, diagnostics, and certain maintenance tasks.

If the hidden menu on your MMI isn’t enabled yet, check out our dedicated tutorial:

→ Enable the hidden green menu on Audi

Important: Before making any changes

The Engineering menu provides access to functions that are not normally intended for everyday use.

Never change a setting at random.

Be especially careful with functions related to:

the firmware;
the bootloader;
updates;
the file system;
hardware settings.

Improper handling or interrupting a software operation may cause the MMI to malfunction.

Important

The procedures presented on VAG Coding must always be tailored to the vehicle model, model year, MMI generation, system part number, and software version.

Two Audi vehicles from the same generation may sometimes be equipped with different multimedia systems.

Be sure to always identify your MMI before following a procedure.

Not sure which MMI you have?

Compare the software version displayed on your MMI with the various reference numbers and photos shown in this tutorial.

If you are unable to identify your system:

Your Audi model
the vehicle’s model year
the MMI reference
the software version displayed in the system information.

This will make it easier for you to determine which procedure for accessing the Engineering menu applies to your system.

L’article Access the Audi Red Engineering menu est apparu en premier sur VAG Coding.

MST2, MHI2, MIB2 Software Update

T0MS — Mon, 17 Aug 2026 00:21:06 +0000

Software Update for MST2, MHI2, and MIB2 in Volkswagen, Seat, and Škoda Vehicles

The MIB2 multimedia systems installed in Volkswagen, Seat, and Škoda vehicles use different firmware versions. A software update can help fix certain bugs, improve system stability, and resolve certain issues related to MIB2 operation, including connection, detection, or compatibility issues with Apple CarPlay and Android Auto.

Before performing any update, it is essential to accurately identify the software version installed on your system. Not all MST2 or MHI2 firmware versions are compatible with all MIB2 units.

What is MST2/MHI2 firmware?

The term MST2 or MHI2 refers to a family of software systems used in certain MIB2 units from the Volkswagen Group on Technisat, Delphi, and Harman multimedia units.

In particular, you may come across references such as:

MST2_EU_VW_ZR_PxxxxT

MST2_EU_SE_ZR_PxxxxT

MST2_EU_SK_ZR_PxxxxT

MST2_EU_VW_P0XXXD

MHI2_ER_VWG1X_XXXX

The SW Train’s full reference number identifies the unit’s platform and software family.

MST2 T = Technisat
MST2 D = Delphi
MHI2 = Harman

It is therefore important not to choose firmware based solely on the vehicle model.

How can I find out the software version of my MIB2?

To view the currently installed version:

Press and hold the MENU button for about 3 seconds.
Select Update / Software Versions.
Check the version of SW Train installed.
Write down the complete reference number displayed on the screen.

Example:

MST2_EU_VW_ZR_P0369T

This information is essential for determining which update can be installed.

Volkswagen MST2 / MHI2 Update

Volkswagen MIB2 systems may be available on Discover Media or Composition Media systems, among others.

Examples of references:

MST2_EU_VW_ZR_P0XXXT

MST2_EU_VW_PQ_P0XXXT

MST2_EU_VW_P0XXXD

MHI2_ER_VWG1X_XXXX

Compatibility depends on the exact firmware version and the unit installed in the vehicle.

Update Available for Volkswagen

Volkswagen models compatible with MST2 / MIB2

Golf 7 (5G) — Discover MIB2 / MIB2.5
Passat B8 (3G) — Discover MIB2 / MIB2.5
Touran 2 (5T / 2T) — Discover MIB2 / MIB2.5
Tiguan 2 (AD1) — Discover MIB2 / MIB2.5
Polo 5 (6C) — certain Discover MIB2 versions
Polo 6 (AW1) — Discover MIB2.5
T-Roc (A1) — Discover MIB2.5
T-Cross (C1) — Discover MIB2.5
Arteon (3H) — Discover MIB2
Transporter T6 / Caddy / Scirocco / Tiguan 1 (5N2) / New Beetle / Sharan —particularly models from 2015 onward equipped with Discover PQ MIB2

Warning: The model alone is not sufficient to determine compatibility. It is especially important to check the firmware reference in MENU → Update / Software Versions → Installed SW Train Version. VAG Custom specifically lists the following families: MST2_EU_VW_P0XXXD, MST2_EU_VW_ZR_P0XXXT, and MST2_EU_VW_PQ_P0XXXT.
Versions beginning with MSTD are not affected by this update.

→ MST2 / MHI2 Discover Volkswagen Software Update

Mise à jour Logiciel MST2 / MHI2 Discover Volkswagen

Seat MST2 / MHI2 Update

Seat vehicles equipped with MIB2 feature systems such as Easy Connect, Media System, and Navi System.

References may begin with, for example:

MST2_EU_SE_ZR_P0XXXT

MST2_EU_SE_PQ_P0XXXT

MHI2_ER_SEG11_XXXX

Example of an update:

MST2_EU_SE_ZR_P0449T → MST2_EU_SE_ZR_P0480T

The VAG Custom page specifically notes compatibility with certain Seat Leon 5F, Ibiza, Ateca, Toledo, and Alhambra models equipped with MIB2. Versions beginning with MSTD are not affected by this update.

Update Available for Seat

→ MST2 / MHI2 Easy Connect Seat Software Update

Mise à jour Logiciel MST2 / MHI2 Easy Connect Seat

Škoda MST2 / MHI2 Update

Škoda MIB2 models can use the Amundsen, Bolero, or Columbus systems, among others.

References may begin with, for example:

MST2_EU_SK_ZR_P0XXXT

MST2_EU_SK_PQ_P0XXXT

MHI2_ER_SKG1X_XXXX

Example of an update:

MST2_EU_SK_ZR_P0449T → MST2_EU_SK_ZR_P0480T

The update offered by VAG Custom applies specifically to certain Škoda Octavia 3, Superb, Fabia, and Yeti models equipped with compatible MIB2 units.

Update Available for Škoda

→ MST2 / MHI2 Software Update for Amundsen / Bolero / Columbus Škoda

Mise à jour Logiciel MST2 / MHI2 Amundsen Skoda

Why should you update your MIB2?

A firmware update may be particularly useful in the following cases:

system slowdowns
software bugs
Bluetooth issues
Connection issues with App-Connect / Full Link / Smartlink
system instability or reboots
bugs fixed in a newer software version.

However, an update does not automatically add all the features available in newer versions. For example, installing new firmware alone does not guarantee that CarPlay or Android Auto will be available if the necessary hardware or licenses are not present.

Be sure to check firmware compatibility

Ne choisissez jamais un firmware MST2 / MHI2 uniquement parce qu’il correspond à votre marque ou à votre modèle de véhicule.

In particular, you should check the following:

The complete SW Train reference
the unit’s platform
the unit’s manufacturer
the hardware version
the region
compatibility with the installed firmware version.

A failed update or an interruption during installation may cause the multimedia system to malfunction.

It is recommended that you have a stable power supply throughout the entire operation.

What do you need?

Depending on the unit and the method used, the update may require:

a Windows computer;
an SD card or compatible storage device;
the firmware that matches the unit exactly;
enough time to complete the update;
a stable power supply for the vehicle.

Do not use the navigation SD card containing your map data to perform an update without first checking the instructions for your unit.

Are you looking for the right firmware for your MIB2?

If you’re not sure which version to use for your MIB2, VAG Custom offers software updates tailored to the various MST2 families from Volkswagen, Seat, and Škoda.

Before proceeding with the update, always check the ” Installed SW Train Version ” reference displayed in your MIB2.

Important: An MST2/MHI2 software update is specific to the installed unit. If in doubt, do not install firmware whose compatibility has not been verified.

VCDS: Cooling circuit purge

T0MS — Sun, 08 Jun 2025 10:41:24 +0000

Cooling system drain (LDR) procedure with VCDS ?

For diesel engine EA288 (1.4TDI, 1.6TDI, 2.0TDI) and petrol engine EA888 (1.8 & 2.0 TSI / TFSI)

Why can’t these engines be purged the old-fashioned way, or at least not easily?
In the past, to bleed a circuit, all you had to do was fill the circuit, idle the engine until the calorstat opened to bleed the engine, and open the heater to bleed the heating circuit. In some cases, air bubbles could be easily evacuated using bleed screws at the top of the circuit.
The EA288 motor is equipped with:
– A traditional cooling circuit, but the mechanical water pump is fitted with an electrically-controlled bell which allows it to be “disengaged” according to T°C conditions.
– A charge air cooler circuit equipped with an additional electric pump
– A heating circuit also equipped with an additional electric pump.
– In some cold countries, these engines are equipped with auxiliary heaters.
Since these engines have the particularity of not heating up much (when the needle reads 90°, the actual temperature doesn’t even reach 80°), we had to add a number of devices to ensure that, in winter, not only could the engine reach operating temperature quickly, but also that passengers could enjoy warm air from the ventilation nozzles from the very first kilometers.

As the system is so voluminous (nearly 8.5L on the 2.0TDI) and riddled with valves and pumps that can’t be opened or controlled manually, it’s virtually impossible to bleed the system properly without spending ages on it. In the case of the heating circuit, for example, the valves are electrically controlled, so if the sensor that gives the command to open the valve is in an air pocket, you can always turn the heating knob to the red, but the valve will never open.
Using VCDS, you can control these valves and pumps cyclically, enabling you to purge the circuit without fear of any remaining air.

The procedure consists of 2 steps. The first consists of purging the engine cooling circuit while the engine is running, while the second consists of purging the low-temperature part of the engine when the engine is stopped.

-> VCDS: Secure Access Code List
-> VCDS: Checking mileage
-> VCDS: Reset DSG

WARNING, you must have a fully charged battery or a connected charger/maintainer (the latter is strongly recommended)!!!!

Step 1, purge engine cooling circuit.

Fill up the expansion tank, connect the VCDS, switch on the ignition without starting and connect to the 01-Motor ECU.
[16-Secure access] enter the code proposed by VCDS if necessary
[10-Adaptations]: “IDE08287-Cooling circuit air purge control > new value = Enabled> [Save!]

Wait 10 sec and start the engine at idle.
[04-Basic settings] > [Display measurement data] Check the values:
IDE00021 / IDE00322 / IDE00450 / IDE00787 / IDE07725

Leave this window open, then return to
[04-Basic settings]: “IDE08087-Control – cooling circuit air purge > [Go!]

Keep the brake and gas pedal pedals depressed (use shims to avoid cramping…)
This stage lasts about 15 minutes, with the engine alternating between idle, 2500 and 3000 rpm
During this stage, keep an eye on the fluid level in the vessel!

The process is underway…

At the end of the cycle, the lines IDE00322 and IDE00450 indicate that this step is complete – click on [Stop].

Stop the motor

Step 2, purge the low-temperature circuit.
[16-Secure access] enter the code proposed by VCDS if necessary
[04-Basic settings] > [Display measurement data] check the values:
IDE00021 / IDE00085 / IDE00322 / IDE00450 / IDE00451 / IDE00787 / IDE07725

Leave this window open, then return to
[04-Basic settings]: “IDE04795-Control – low-temperature circuit air purge > 4S > [Go!]

This stage lasts about 10 minutes, and you can hear the various pumps working, the pipes gurgling and bubbles occasionally rising in the vase.

At the end of the cycle, the IDE00322 lines indicate that this step has been completed and you can click on [Stop].

Repeat step 2 at least 2 times (3 times in total) and as many times as necessary as long as the “gurgling” sound is heard and/or bubbles are rising in the vessel.

Check the fluid level before going for a test drive (take a can in the trunk and check the level after driving a few km).

L’article VCDS: Cooling circuit purge est apparu en premier sur VAG Coding.

VCDS: Reset tire pressure

T0MS — Sat, 14 Dec 2024 20:40:25 +0000

Resetting tire pressure warning light via VCDS / OBDeleven diagnostic tool

Tire Pressure Reset (TPMS)

The Tire Pressure Monitoring System (TPMS) on Volkswagen vehicles is an essential tool for ensuring your safety and optimizing the life of your tires. After adjusting tire pressure or changing tires, it is often necessary to reset this system. Here’s a step-by-step guide to carrying out this operation on different Volkswagen models.

-> Checking mileage
-> SFD Protection
-> VCDS: Reset DSG

Contents:

When to reset the tire pressure system?
Reset steps via VCDS
Reset TPMS tire pressure display for MQB vehicles
Reset Tire Pressure Indicator for Audi after 2018
Important notes

1 – When to reset the tire pressure system?

After adjusting tire pressure.
After replacing one or more tires.
In the event of an erroneous TPMS warning.
After tire rotation.

If the tire pressure warning light remains on despite an attempt to reset it using the button in the glovebox (e.g. on a Golf 6) or in the CAR menu on the car radio, you can solve the problem using a diagnostic tool such as VCDS.

Context: RKA system

The RKA tire-pressure monitoring system (tire-pressure indicator) uses data from the ABS computer to detect anomalies. It does not measure pressure directly, but identifies deviations in wheel rotation.
The driver will inflate the tires to the correct set pressures, and the system will memorize them at the press of a button.
When a loss of pressure has been detected, the driver will be alerted by the tire pressure warning light, illuminated continuously on the speedometer, and at the same time by an audible signal.
The light remains on until the system is recalibrated.

Prerequisites

Ignition on: Make sure the ignition is switched on (engine off).
Correct pressure: Check that tires are inflated to manufacturer’s specifications.

2 – Reset steps via VCDS

You can reset your tire pressure via your display or glovebox button, but if you no longer have the original display (Android-style) or your button no longer works, you can reset with VCDS:

1. Vehicle connection

Connect the VCDS cable to the vehicle’s OBD-II port.
Connect the other end to the PC or compatible device.
Launch VCDS software.

2. ABS ECU access

For PQ35 vehicles (Golf 5/6 / Passat B6/B7 / Tiguan 1 …)

In the VCDS main menu, click on [Select].
[03 – Brake Electronics] or ABS in French
[Basic Settings – 04]
Group 042
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
[Done, Go Back]
[Close Controller, Go Back – 06]

For MQB vehicles (Golf 7 / Passat B8 / Tiguan 2 / Leon / Octavia … )

Connect cable to obd socket
contact then launch VCDS
click on select
03 – ABS brakes
04 – Basic settings
Select from the drop-down menu : Reset tire pressure indicator warning
Click on go and follow the on-screen instructions

With OBDeleven :

3 – Resetting the TPMS tire pressure display for MQB vehicles

VOLKSWAGEN GOLF 7 / PASSAT B8 / T-ROC / ARTEON / TOURAN / TIGUAN 2 / POLO 6 / SEAT LEON 5F / SKODA OCTAVIA 3 5E / KAROQ / KODIAQ / SUPERB 3V

-> MQB platform

Tire pressure monitoring system

A reset is necessary after :

Checking/adjusting tire pressure
Replacement of one or more tires/wheels
Resetting the tire pressure monitoring system

Switch on the ignition
Scroll through the on-screen menu

Press the “CAR” button
Select “Vehicle settings”.

Select “TIRES

Select “SET”
Select “CONFIRM”
LED must not be lit
System is reset

Please note that the presence of the monitoring system does not exempt you from checking your tire pressure at least once a month.

In fact, since the system only monitors the difference in rotation speed of the wheels on the same axle, and if the wheels lose approximately the same pressure (a normal phenomenon over time), you could find yourself driving with under-inflated tires without any warning from the system!

4 – Reset Tire Pressure Indicator for Audi after 2018

How to reset tire pressure on Audi (A1 GB, A3 8Y, A4 B9, A5 F5, A6 C8, A7 C8, A8 D5, Q2 GA, Q3 F3, Q5 FY, Q7 4M, Q8 4M)

Step 1: Preparation

Before starting the reset, make sure all tires are inflated to the recommended pressure. Use a pressure gauge to check the pressure of each tire. Pressure specifications are available on the label inside the driver’s door or in the owner’s manual.

Step 2: Access Vehicle Settings

Settle into the interior of your Audi.
Insert the key and switch on the dashboard without starting the engine.
Use the central touchscreen to access the general menu.

Step 3: Menu navigation

Access the main touchscreen menu (Home logo).
Select the “Vehicle” option.
Navigate to “Settings and Maintenance”.
Select “Tire pressure check”.

Step 4: Reset tire pressure

Select the “Memorize tire pressures” option.
Confirm the reset by following the on-screen instructions.

Step 5: Verification and finalization

Switch off the dashboard once the reset is complete.
Restart the vehicle to check that the TPMS light has gone out.

5 – Important notes

TPMS light activated after reset: This may indicate a leak or incorrect pressure in one of the tires. Check tires and adjust if necessary.
Recommended pressure: Always consult your owner’s manual for the recommended pressure for your model.
Models with direct TPMS sensors: Some Volkswagen vehicles use sensors in each wheel. If the sensor is defective, it must be replaced.

L’article VCDS: Reset tire pressure est apparu en premier sur VAG Coding.

OBDeleven One-Click Apps list

T0MS — Thu, 14 Nov 2024 18:49:29 +0000

List of coding and modification options with OBDeleven OBD11 ONE-CLICK APPS for vehicles from the VAG Group (Audi, Volkswagen, Seat, Skoda)
–> Buy your OBDeleven device with VAG Custom

-> VCDS vs OBDeleven comparison

OBDeleven One-Click Apps Audi list

OBDeleven One-Click Apps A1 (8X) list

OBDeleven One-Click Apps A1 list (GB)

OBDeleven One-Click Apps A2 (8Z) list

OBDeleven One-Click Apps A3 list (8L)

OBDeleven One-Click Apps A3 list (8P)

OBDeleven One-Click Apps A3 (8V) list

OBDeleven One-Click Apps A3 (8Y) list

OBDeleven One-Click Apps A4 (B5) list

OBDeleven One-Click Apps A4 (B6) list

OBDeleven One-Click Apps A4 (B7) list

OBDeleven One-Click Apps A4 (B8) list

OBDeleven One-Click Apps A4 (B9) list

OBDeleven One-Click Apps A5 (8T) list

OBDeleven One-Click Apps A5 list (F5)

OBDeleven One-Click Apps A6 list (C5)

OBDeleven One-Click Apps A6 (C6) list

OBDeleven One-Click Apps A6 (C7) list

OBDeleven One-Click Apps A6 (C8) list

OBDeleven One-Click Apps A7 (C7) list

OBDeleven One-Click Apps A7 (C8) list

OBDeleven One-Click Apps A8 (D3) list

OBDeleven One-Click Apps A8 (D4) list

OBDeleven One-Click Apps A8 (D5) list

OBDeleven One-Click Apps E-TRON (GE) list

OBDeleven One-Click Apps Q2 (GA) list

OBDeleven One-Click Apps Q3 (8U) list

OBDeleven One-Click Apps Q3 (F3) list

OBDeleven One-Click Apps Q5 (8R) list

OBDeleven One-Click Apps Q5 (FY) list

OBDeleven One-Click Apps Q7 (4L) list

OBDeleven One-Click Apps Q7 list (4M)

OBDeleven One-Click Apps Q8 list (4M)

OBDeleven One-Click Apps R8 list (42)

OBDeleven One-Click Apps TT (8N) list

OBDeleven One-Click Apps TT list (8J)

List OBDeleven One-Click Apps TT (8S)

OBDeleven One-Click Apps Volkswagen list

OBDeleven One-Click Apps AMAROK list (2H)

OBDeleven One-Click Apps ARTEON list (3H)

OBDeleven One-Click Apps BEETLE (5C) list

OBDeleven One-Click Apps CADDY list (2K)

OBDeleven One-Click Apps CC list (35)

OBDeleven One-Click Apps EOS list (1F)

OBDeleven One-Click Apps FOX list (5Z)

List OBDeleven One-Click Apps GOLF 4 (1J)

List OBDeleven One-Click Apps GOLF 5 (1K)

List OBDeleven One-Click Apps GOLF 6 (5K)

OBDeleven One-Click Apps GOLF 7 (5G) list

List OBDeleven One-Click Apps GOLF 8 (5H)

OBDeleven One-Click Apps ID.3 list (E1)

OBDeleven One-Click Apps ID.4 list (E2)

OBDeleven One-Click Apps LUPO list (6E)

List OBDeleven One-Click Apps NEW BEETLE (1C)

List OBDeleven One-Click Apps PASSAT (B5)

OBDeleven One-Click Apps PASSAT list (B6)

List OBDeleven One-Click Apps PASSAT (B7)

List OBDeleven One-Click Apps PASSAT (B8)

OBDeleven One-Click Apps PHAETON list (3D)

OBDeleven One-Click Apps POLO 3 (6N) list

OBDeleven One-Click Apps POLO 4 (9N) list

OBDeleven One-Click Apps POLO 5 (6R) list

OBDeleven One-Click Apps POLO 5 (6C) list

OBDeleven One-Click Apps POLO 6 (AW1) list

OBDeleven One-Click Apps list SCIROCCO (13)

OBDeleven One-Click Apps SHARAN (7N) list

OBDeleven One-Click Apps T-CROSS (C1) list

List OBDeleven One-Click Apps T-ROC (A1)

OBDeleven One-Click Apps TAIGO (CS) list

List OBDeleven One-Click Apps TIGUAN (5N)

List OBDeleven One-Click Apps TIGUAN 2 (AD1)

OBDeleven One-Click Apps TOUAREG list (7L)

OBDeleven One-Click Apps TOUAREG list (7P)

List OBDeleven One-Click Apps TOUAREG 3 (CR)

List OBDeleven One-Click Apps TOURAN (1T)

List OBDeleven One-Click Apps TOURAN (1T3)

List OBDeleven One-Click Apps TOURAN (2T)

List OBDeleven One-Click Apps TRANSPORTER (T4/T5)

List OBDeleven One-Click Apps TRANSPORTER (T5.1)

List OBDeleven One-Click Apps TRANSPORTER (T6)

List OBDeleven One-Click Apps TRANSPORTER (T6.1)

OBDeleven One-Click Apps UP! list (1S)

OBDeleven One-Click Apps Seat / Cupra list

OBDeleven One-Click Apps Skoda list

Source: exhaustive list provided by OBDeleven for VAG Coding

L’article OBDeleven One-Click Apps list est apparu en premier sur VAG Coding.

VCDS: What is SFD protection?

T0MS — Thu, 14 Nov 2024 13:49:09 +0000

VCDS: What is SFD and SFD2 protection?

SFD (Schutz der FahrzeugDiagnose) is a protection system implemented by the Volkswagen Group to secure access to the control modules in modern vehicles.

In particular, this protection restricts certain modification operations, such as coding, adjustments, basic settings, and certain actuator tests.

However, standard diagnostics are generally still possible: reading the ECU data, retrieving fault codes, and viewing measurement values are not blocked by SFD.

With the introduction of newer vehicles, Volkswagen subsequently enhanced this system with SFD2.

SFD and SFD2 should not be confused. SFD2 is an extension of the SFD system with additional security mechanisms.

What does SFD stand for?

SFD stands for:

Protection of Vehicle Diagnostics

which can be translated as:

Vehicle Diagnostic Protection.

SFD began to be deployed in VAG vehicles starting with the 2020 model year and was then gradually expanded to include more models and control modules.

It is important to understand that SFD does not necessarily protect all of a vehicle’s control modules.

A single vehicle may have:

computers without SFD;
SFD-protected computers;
controllers protected by SFD2;
computers protected by multiple security measures.

Why does Volkswagen use SFD?

The goal of SFD is to prevent unauthorized modifications to the control units.

In particular, it can protect:

encoding;
adaptations;
basic settings;
actuator testing;
certain programming functions.

This development is also part of the overall strengthening of automotive cybersecurity and compliance with UNECE Regulations R155 and R156.

Which vehicles are covered by SFD?

SFD was gradually introduced on VAG models starting with the 2020/2021 model years.

You can find him on the following sites, among others:

Volkswagen Golf 8
Volkswagen ID.3
Volkswagen ID.4
Volkswagen Tiguan
Volkswagen Caddy
Audi A3 8Y
Audi Q4 e-tron
SEAT Leon
CUPRA Formentor
Škoda Octavia
Škoda Enyaq

This list is not exhaustive.

Above all, the presence of SFD depends on the control module, not just the model.

How can you tell if a computer is protected by SFD?

The easiest way to use VCDS is to run an Auto-Scan.

In the VCID line of the ECU, VCDS may display the following message:

SFD

For example:

VCID: XXXXXXXX SFD

This indicates that the ECU requires an SFD unlock for certain protected operations.

What can you do without unlocking SFD?

SFD does not completely block the diagnosis.

It is generally still possible to:

read the ECU identification;
read the trouble codes;
view the measurement values;
perform certain maintenance tasks.

However, some features may be disabled:

Coding
Adaptation
Basic Settings
Actuator Tests

The level of protection depends on the control unit and the requested function.

Unlock SFD with a VCDS token

VCDS allows you to temporarily unlock an SFD control module using an SFD token.

This method allows you to obtain temporary authorization to perform protected operations.

This procedure applies to SFD. It does not allow you to unlock features protected by SFD2.

1. Open the protected calculator

In VCDS, open the relevant control module.

When VCDS detects SFD protection, the button for accessing SFD functions becomes available.

Click on SFD.

2. Read the SFD token

In the SFD window, select:

Read Token

then click:

Do It

VCDS then retrieves the token required for the unlock request.

3. Copy the token

Once the token is displayed, copy it.

This token corresponds to the authorization request generated by the computer.

4. Get the SFD response

The retrieved token must then be used with the service that returns the SFD authorization response.

Once the request has been processed, a cryptographic response is obtained that allows for temporary unlocking.

5. Enter the response in VCDS

Return to the VCDS SFD window.

Enter the answer you obtained in the field provided.

You can use the Paste command to paste it.

Next, click on:

Do It

6. The computer is temporarily unlocked

If the response is valid, VCDS obtains the necessary authorization.

Protected functions can then be used during the authorization period.

The SFD unlock is temporary

Unlocking does not remove SFD at all.

The computer remains protected.

The authorization simply allows you to temporarily perform the authorized actions.

So we need to talk about:

Temporary SFD unlock

and not:

Elimination of the SFD.

Ross-Tech confirms that SFD and SFD2 cannot be permanently disabled using VCDS or ODIS.

SFD Online with VCDS

Recent versions of VCDS have also shifted toward online SFD management.

This method allows you to request SFD authorization directly through the service provided for this purpose, rather than always having to go through a manual offline token procedure.

SFD Online and offline SFD tokens are two different methods for managing SFD unlocking.

Availability depends, among other things, on the version of VCDS, the interface used, and the service being accessed.

VAG Coding Interface Compatibility

VAGCOM HQ V1 – ATMEGA162

VAGCOM HQ V1 interfaces equipped with an ATMEGA162 are primarily intended for older VAG models.

They do not support the SFD functions of newer vehicles.

SFD: Not compatible

VAGCOM HQ V2 – STM32F405/429 ARM

VAGCOM HQ V2 interfaces equipped with an STM32F405/429 ARM processor are suitable for newer VAG vehicles.

SFD: Compatible depending on the unlocking method used

Please note: Compatibility with a vehicle does not automatically mean that all protected features will be accessible.

SFD with OBDeleven

OBDeleven supports unlocking the classic SFD on many VAG vehicles.

This allows certain encoding and adaptation operations to be performed that are normally protected.

Availability, however, depends on the model, year, control module, and the specific function you are looking for.

SFD2: The Next Generation of Protection

SFD2 is an extension of the SFD system.

It does not replace SFD.

Its goal is to strengthen protection against unauthorized modifications, particularly on highly sensitive systems.

Ross-Tech states that SFD2 is designed, among other things, to:

driver-assistance systems;
automated driving;
software updates;
cybersecurity;
functions subject to the requirements of UNECE Regulations R155 and R156.

With SFD2, certain modifications must be digitally and cryptographically signed by the manufacturer.

Which vehicles are equipped with SFD2?

SFD2 primarily applies to VAG vehicles manufactured in accordance with the new cybersecurity requirements, specifically starting in 2023/2024, depending on the model.

OBDeleven has published a list of models currently identified as being equipped with SFD2. Since this list is subject to change, it should be considered for informational purposes only.

Audi

Model	SFD2 starting at
A1 GB	21/03/2024
A3 8Y	2025
A4 8W	2024
A5 F5	2024
A6 4A	2024
A7 4K	2024
A8 4N	2024
Q2 GA	21/03/2024
Q3 F3	25/03/2024
Q4 F4	25/11/2023
Q5 FY	2024
Q7 4M	14/08/2023
Q8 4M	14/08/2023
e-tron GE	2024
e-tron GT F8	2024

Volkswagen

Model	SFD2 starting at
Arteon 3H	2024
Crafter SY	2025
SB Cart	2025
Golf 8 CD / CG	01/04/2024
AE1 Polo Shirt	12/03/2024
T-Cross D31	depending on production
Touran 5T	06/03/2024
T-Roc D11 / AC8	24/03/2024
Taigo CS	18/03/2024
Tiguan Allspace BJ2	19/02/2024
Tuareg RC	depending on production
T7 ST	according to PR-Code
ID.3 E12	2025
ID.4 E21	15/01/2024
ID.5 E39	15/01/2024
ID. Buzz EB	2025

Škoda

Model	SFD2 starting at
Enyaq 5A	according to PR-Code
Fabia PJ	2024
Kamiq NW4	29/01/2024
Scala NW1	29/01/2024
Karoq NU	25/03/2024
Octavia NX	according to PR-Code

SEAT / CUPRA

Model	SFD2 starting at
SEAT Arona KJ7	12/02/2024
SEAT Ateca KBP / KHP	according to PR-Code
SEAT Born K11	2025
SEAT Ibiza KJ1	12/02/2024
SEAT Leon KL	2025
SEAT Leon KU	2025
CUPRA Formentor KM7	2025

A list of vehicles isn’t enough

Even with this list, you should not assume that a vehicle is fully locked by SFD2.

SFD2 may affect certain control modules and functions.

The best way to check a specific vehicle is therefore to look at its VCDS Auto-Scan.

How do you identify SFD2 using VCDS?

In Auto-Scan mode, a diagnostic scanner can display:

SFD+SFD2

Or in the Calculator Settings:

This means that the control unit is affected by SFD and SFD2.

Ross-Tech gives, for example, a Gateway with ” SFD+SFD2 ” displayed in the VCID.

Can SFD2 be unlocked with an SFD token?

No.

That is a fundamental difference.

The token used for the classic SFD does not simply allow you to bypass SFD2.

SFD2 introduces additional mechanisms, and certain operations must be cryptographically signed.

That is precisely what makes retrofits and certain programming tasks much more difficult on the vehicles in question.

SFD2 and Retrofits

SFD2 can significantly limit certain retrofits.

For example, installing new equipment may require:

encoding;
an adaptation;
a configuration;
a program;
a manufacturer’s authorization.

If the procedure requires a function protected by SFD2, simply using VCDS or OBDeleven may not be sufficient.

VCDS and SFD2

VCDS allows you to diagnose the affected vehicles and identify the active safety features.

However, SFD2 should not be viewed as a traditional SFD that can simply be unlocked with a token.

The inclusion of a VAGCOM HQ V2 STM32F405/429 ARM chip provides better compatibility with newer vehicles, but does not bypass the vehicle’s built-in security measures.

OBDeleven and SFD2

The situation is currently even more restrictive.

OBDeleven notes that as of 2026, VAG vehicles manufactured starting in 2024 with the new SFD2 security measures are not yet fully supported for advanced functions. Specifically, the app can communicate with the main gateway, but full access to other ECUs remains limited.

OBDeleven is always working to improve this compatibility.

The situation may change with future updates to OBDeleven.

VAGCOM HQ V1, V2, and OBDeleven

Function	HQ V2 STM32F405/429	OBDeleven
Classic Cars
MQB
MQB evo
SFD	*
SFD2	Limited	/
Conventional Diagnosis

* Depending on the version of VCDS, the interface and the available authorization method may vary.

For OBDeleven, SFD2 compatibility must be checked carefully: the current official documentation indicates that the affected VAG 2024+ models are not yet fully supported.

Example: Golf 7 and Golf 8

Under no circumstances should you automatically apply the coding from a Golf 7 to a Golf 8.

Golf 7

MQB

→ Older electronic architecture
→ Many encodings are directly accessible.

Golf 8

MQB evo

→ newer electronic architecture
→ SFD available on certain control units.

Newer Golf 8

→ Certain versions/computers may now be affected by SFD2.

The production date has therefore become particularly important.

Before You Start Coding

Before modifying a recent VAG vehicle:

Run a full Auto-Scan.
Check the control module part number.
Check the software version.
Search for SFD and SFD2 in the VCID.
Preserve the original encoding.
Make sure the tutorial matches your vehicle exactly.
Do not automatically apply a coding system from a different generation.
Make sure your interface is compatible with the vehicle.

Frequently Asked Questions About SFD and SFD2

What is SFD protection?

SFD is a protection mechanism implemented by the Volkswagen Group to prevent certain unauthorized modifications to the control modules. In particular, it can protect coding, adaptations, and certain diagnostic functions.

What is the difference between SFD and SFD2?

SFD2 is an evolution of SFD with additional security mechanisms. Certain functions protected by SFD2 require specific cryptographic authorization and cannot be unlocked with a standard SFD token.

How can I tell if my car has SFD?

Perform an Auto-Scan with VCDS and look for the entry “SFD” in the ECU information. The presence of “SFD” may vary from one ECU to another.

How can I tell if my car has SFD2?

In VCDS, some control modules may appear with the designation SFD+SFD2 in the VCID. This indicates that the control module is subject to both levels of protection.

What vehicles does SFD have?

SFD is primarily found in modern VAG vehicles, including certain Golf 8, Audi A3 8Y, Škoda Octavia 4, SEAT Leon KL, CUPRA Formentor, ID.3, and ID.4 models.

Which vehicles are equipped with SFD2?

SFD2 has gradually been introduced on newer VAG vehicles. It can be found in particular on certain Golf 8, Audi A3 8Y, Audi Q4, Audi Q7, Volkswagen Tiguan, Passat, Škoda Octavia, Enyaq, SEAT Leon, and CUPRA models, depending on the model year and the control module.

Does every Golf 8 come with SFD2?

No. The presence of SFD2 depends, among other things, on the model year, the control module, and its software version. Two Golf 8s may therefore have different safety features.

Does a Golf 7 have SFD2?

No, the Golf 7 is generally not affected by SFD2. SFD is primarily used in newer VAG models.

Can a car equipped with SFD be programmed?

Yes. You simply need to unlock the control unit when the function you’re using is protected by SFD.

Can you program a car equipped with SFD2 using VCDS?

Some operations are still possible, but SFD2 imposes additional restrictions. A standard SFD unlock alone does not provide access to all functions protected by SFD2.

Can SFD be deleted or disabled?

No. SFD is a safety feature built into the vehicle. Unlocking it only grants temporary authorization to perform certain operations.

Can we remove SFD2?

No. SFD2 cannot be permanently disabled using VCDS or OBDeleven.

Can an SFD token be used to unlock SFD2?

No. A token intended for the classic SFD cannot be used to bypass the additional protections in SFD2.

What is the difference between an SFD token and an SFD Online token?

With an SFD token, the process involves retrieving a request from the ECU and then obtaining a response that enables unlocking.

With SFD Online, the authorization request is submitted directly through the VCDS-compatible online service.

Is the SFD unlock permanent?

No. The unlock is temporary. Once authorization is complete, the control unit returns to its protected state.

Does SFD prevent fault codes from being read?

No. SFD is primarily intended for modification operations. Error codes and a wide range of diagnostic information generally remain accessible.

Does SFD block VCDS modifications?

Some adaptations, yes. If the adjustment is protected, the control unit must be unlocked before it can be modified.

Does SFD block all encodings?

No. Only protected functions are affected. A vehicle can therefore accept certain codes without unlocking and block others.

Why does my VCDS programming work on a Golf 7 but not on a Golf 8?

The two vehicles do not use exactly the same electronic architecture. In particular, the Golf 8 uses an MQB evo architecture, and some control modules are protected by SFD.

A code intended for a Golf 7 should therefore not be automatically applied to a Golf 8.

Does VAGCOM HQ V1 ATMEGA162 work with SFD?

No. This generation of interface is not compatible with the SFD functions of newer vehicles.

Does VAGCOM HQ V2 STM32F405/429 work with SFD?

Yes, communication with compatible vehicles is possible, but access to protected functions then depends on VCDS and the available authorization method.

Can OBDeleven unlock SFD?

Yes, OBDeleven supports SFD on many compatible vehicles.

Can OBDeleven unlock SFD2?

Support for SFD2 is much more limited. You must verify that the vehicle, the ECU, and the feature are compatible with the current version of OBDeleven.

Why are some calculators accessible while others display “SFD”?

Because SFD is applied at the ECU level and not necessarily to the entire vehicle.

It is therefore normal for a single vehicle to have multiple control modules with different levels of protection.

What does “SFD+SFD2” mean in VCDS?

This indication means that the control unit is affected by SFD and SFD2. Protected functions may therefore require additional permissions.

What does “-R” mean in a VCDS Auto-Scan?

The -R flag may indicate that a control unit is subject to a Diagnostic Filter or Diagnostic Firewall, which may restrict access to it from an independent diagnostic tool.

Does SFD2 prevent retrofits?

Some retrofits may be severely limited. If the installation requires an adjustment, configuration, or a function protected by SFD2, a simple modification using VCDS or OBDeleven may not be sufficient.

Why does my tool communicate with the car but refuse to perform the coding?

Communication with the computer and authorization to make changes are two different things.

An ECU may be fully accessible for diagnostics but may refuse a write operation due to SFD, SFD2, or another form of protection.

Conclusion

VAG vehicle protection has evolved significantly.

There are now several levels of protection available:

SFD → SFD2 → Diagnostic Filter / Firewall

The standard SFD can be temporarily unlocked, including through a procedure that uses a token or compatible online solutions.

SFD2 is much more restrictive. Certain functions must be cryptographically authorized by the manufacturer, and consumer diagnostic tools cannot simply bypass this protection.

SFD2 has become particularly common in VAG vehicles produced starting in 2023/2024, depending on the model and the control module. The list of models is updated regularly.

Key point: SFD and SFD2 cannot be disabled. SFD can be temporarily unlocked when the feature is supported, while SFD2 imposes additional restrictions.

When programming your vehicle, always use a tutorial that exactly matches your vehicle’s model, generation, year, and ECU.

Role and operating principle

Located at the cylinder inlet or in the intake manifold, the injector sprays fuel in microscopic droplets at the end of the compression cycle.

For your car to start, air/fuel combustion must take place. The aim of the injection system is to calculate this fuel/air ratio so that combustion can take place.

The injector then releases the exact quantity of fuel, either directly into the intake manifold in the case of indirect injection (gasoline), or directly into the combustion chamber in the case of direct injection (diesel or gasoline).

Today, injections are managed by an electronic system, which improves engine performance and reduces fuel consumption and pollutant toxins released by the exhaust.

Causes of clogging

In principle, an injector has a fairly long service life. However, clogging problems are common. The cause is fuel quality, as well as scale and resin deposits caused by combustion, which end up clogging the injectors, reducing engine performance and increasing fuel consumption.

Symptoms of a clogged injector

A clogged injector often manifests itself through the following symptoms:

loss of engine power
black exhaust smoke
higher fuel consumption
capricious slow motion
a difficult start
a persistent fuel smell
acceleration holes

If your vehicle shows these symptoms, then your injectors are most likely clogged. However, before you consider replacing them, you need to check them with the VCDS to find out which one is faulty. VAG Coding offers you several tutorials depending on your TDI or TSI engine:

Contents:

Injector inspection 1.6 1.9 2.0 TDI
Injector control / High Pressure Rail 2.0 FSI TSI TFSI
Injector inspection 2.7 / 3.0 V6 TDI Common Rail

-> VCDS: Adaptation of Common Rail injector correction value
-> VCDS: Turbo pressure control
-> VCDS : FAP regeneration

Injector inspection 1.6 1.9 2.0 TDI:

Control for 1.9 TDI and 1.6 / 2.0 TDI CR Common Rail diesel engines (VW Golf 5/6, Polo 4/5, Audi A3 8P, Seat ibiza 6L/6P, Leon …)

5 – Select Group 013

At idle, a flow correction is applied to each injector in relation to a theoretical flow rate to ensure cyclic engine smoothness.
A flow rate deviation of more than +1.5mg/ stroke is considered abnormal, but not necessarily entirely attributable to the injector. (+ 2.8 mg/tps = injector out of order)

If“Measurement group – 08” is greyed out, click on “Mes. Advanced Values”, then search for “injection” / “deviation” in the search bar, and select the lines according to your cylinders.

Injector control / High Pressure Rail 2.0 FSI TSI TFSI

Checking the injection of the 2.0 EA113 engine, our High Pressure Rail test tutorial. This test will tell you if you have a leaking injector.

A leak in the high-pressure injection rail on our 2.0 TSI TFSI engine could cause a number of different problems for your engine. Our TSI TFSI engine features high-pressure injectors, and they must not be neglected!

For 2.0 on VW GOLF 5 / 6 / 7 GTI, VW GOLF 6R 7R or Audi S3 8P 8V …

A reminder of how an injector works

The injector is part of your engine’s fuel supply system. The injectors on our TFSI engine are high-pressure injectors, which operate in direct injection mode (fuel is injected directly into the combustion chamber).

Please note that we’re talking here about direct fuel injection with the Bosch Motronic MED 9.1 system (for our EA113 engine), but that this article applies in general to all engines using the group’s high-pressure injection system: FSI, TFSI or TFSI.

It’s the injector that releases the jet of fuel needed to feed the engine, also known as mist or vaporization.

How an injector works

During injection, the magnetic coil built into the injector is driven, creating a magnetic field. This excites the magnetic armature via a needle, the valve opens and fuel is injected (vaporized).

If the coil is no longer energized, the magnetic field collapses and the valve needle is pushed back into the valve seat by the pressure spring. Fuel flow is interrupted.

Injector components

the injector nose consists of a nozzle sealed by a needle
the upper part of the injector contains an electromagnetic core, controlled by the ECU, which raises the needle for injection.

Injection time

Secondly,injection duration is an important criterion for our engine, as is its cc capacity. The duration of this jet, also known as injection time, is controlled electrically by the engine management ECU, according to parameters read by sensors (engine temperature, accelerator pedal position, engine load determined by intake air pressure, etc.).

Causes of injector leakage

We often wonder why an injector can leak, and it’s a very good question.

On our TFSI engine, there are various “injection system failures”, some of which are due to impurities clogging an injector, resulting in a leak, as either :

they prevent the injector from closing properly (leakage)
they prevent fuel from flowing properly (clogged injector)

The fuel filter, even if you run on SP98, should be replaced every 60,000kms, according to the maintenance schedule.
However, in view of the feedback and observations on the various forums and groups, we strongly recommend replacing it every 30,000kms!

The consequences of a leaking injector

A leaking injector will hinder the proper operation of your injection system, and may even deteriorate it to the point of requiring replacement.

It should also be noted that a leaking injector can cause olfactory and respiratory nuisance for vehicle users, who breathe in fuel and oil vapors, and even more toxic fumes such as carbon monoxide.

Other consequences:

oil pollution with petrol, so the engine oil no longer lubricates the engine properly
oil level rises, leading to engine/turbo failure
combustion misfires
unbalanced load distribution between engine cylinders

How to detect injector failure

A malfunction can be detected by a number of indicators:

A lingering smell of fuel
A loss of power
Start-up problems
jerky acceleration
Smoke in the exhaust
A smell of gasoline if you open the oil filler cap
Missed after big sessions, the engine backfires a bit like a Pop & Bang.

When an injector malfunctions on an FSI / TSI / TFSI engine, you can expect combustion misfires. This is the most common phenomenon.
Fault codes may include: P0300, P0301 (for cylinder 1), P0302 (for cylinder 2), P0303 (for cylinder 3), P0304 (for cylinder 4).

You’ll probably only get misfiring on 1 or 2 cylinders, as it’s unlikely that all 4 injectors will be faulty at the same time (unless your injectors are counterfeit …)
Generally, when these fuel injectors are faulty, they get stuck, causing misfire problems.

Before assuming you have a fuel injector problem, you need to confirm that you do NOT have problems with the following, ignition coils, spark plugs (change every 40-60K) or carbon build-up, but we’ll see that it’s possible to test the injector RAIL too.

All the faults listed are more likely to cause misfiring. Once you’ve checked that none of these is a problem, you need to turn your attention to the injectors.

How do I test an injector leak at the VCDS?

Now, let’s see how you can test your injectors, without dismantling anything. This test will enable you to identify a leak on the injection rail.

To do this, we will use our VAGCOM cable and VCDS software, once the vehicle is at optimum operating temperature (water at 90c°).

Once on the Measurement blocks tab, select the following channels: 106, 141 and 230.

Our engine is running and we have a pressure of 49.68 bar on the rail.

Wait until the water has reached 90°C, then turn off the ignition.

The pressure should increase gradually, as shown here at 62.17 bar.

Now observe the value for a few minutes.

This value should increase significantly!

If it doesn’t (if it doesn’t increase), there must be a leak.

Injector inspection 2.7 / 3.0 V6 TDI Common Rail

For a simple injector check or because you’re having a problem with your V6 TDI, especially after a long drive. The white smoke and shaking you’re seeing could indeed be linked to worn injector seats, which is a valid assumption in this context. Here are some points to consider and possible checks to diagnose and solve the problem:

1. White exhaust smoke

The presence of white smoke can be due to a number of causes. In the context of a diesel engine, here are the possible causes:

Unburned fuel: As you mentioned, worn injector seats can lead to excessive fuel injection into the combustion chamber. This excess fuel may not burn completely, producing white smoke. This smoke is generally the result of incomplete diesel combustion.
Cooling problems: Another potential cause is a problem with the cooling system, such as a faulty cylinder head gasket. This can allow cooling water to enter the combustion chambers, also producing white smoke. If this is the case, you may also see signs of coolant loss or bubbles in the coolant.

2. Engine shaking

Shaking, especially at idle after prolonged operation, can be related to several problems:

Faulty injectors: Worn or faulty injectors can cause shaking due to irregular fuel injection. Worn injector seats can lead to leaks or incorrect atomization, which can cause engine vibration.
Combustion problems: Poor fuel combustion due to faulty injectors can also lead to jerking and reduced idle smoothness.

To assess the condition of your vehicle’s injectors using measurement value blocks 72 to 77 with a diagnostic tool such as VAG-COM (or VCDS), here’s a detailed guide to interpreting the values and detecting possible problems:

Reading Measurement Block Values

5 – Select measurement groups 72 to 77.

6 – Interpretation of Values: Each measurement group will display three values corresponding to different pressure levels (300 bar, 600 bar, 1,000 bar). Values are in milliseconds (ms) and should be read carefully.

Results analysis

For each measurement group, examine the values and compare them with the indicated thresholds. Here’s how to interpret the values provided:

Group 72

Values: -50 ms, -14 ms, -6 ms
- Analysis: The first value (-50 ms) is below the threshold of -45 ms, which may indicate significant needle seat wear for the corresponding injector.

Group 73

Values: -24 ms, -4 ms, -2 ms
- Analysis: None of the values exceed critical thresholds. Injectors appear to be in good condition.

Group 74

Values: -24 ms, -4 ms, -6 ms
- Analysis: None of the values exceed critical thresholds. Injectors appear to be in good condition.

Group 75

Values: -54 ms, -12 ms, -6 ms
- Analysis: The first value (-54 ms) exceeds the critical threshold of -45 ms, which may indicate significant needle seat wear.

Group 76

Values: -36 ms, -6 ms, -6 ms
- Analysis: None of the values exceed critical thresholds. Injectors appear to be in good condition.

Group 77

Values: -48 ms, -12 ms, -6 ms
- Analysis: The first value (-48 ms) exceeds the critical threshold of -45 ms, which may indicate significant needle seat wear.

Conclusion and actions

Defective injectors: Excessive negative values (e.g. -50 ms, -54 ms, -48 ms) indicate that some injectors may be defective due to needle seat wear.
Replacement: We recommend replacing the offending injectors to improve engine performance.

Summary of Critical Thresholds :

First Pressure Level (300 bar): Value below -45 ms (e.g. -60 ms) indicates wear.
Second Pressure Level (600 bar): Value below -15 ms (e.g. -20 ms) indicates wear.

Important notes:

Attention to the Sign (Minus): Values are negative, so a more negative value indicates a more serious problem.
Precise Interpretation: Make sure you understand the values and thresholds before making decisions about injector replacement.

This process will enable you to correctly diagnose your vehicle’s injectors and take the necessary steps to ensure their proper operation.

-> VCDS: Injector replacement and IMA code adaptation on 2.7 / 3.0 V6 TDI Common Rail engines

L’article VCDS: Checking injector values est apparu en premier sur VAG Coding.