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== Visual Summary: SFD Requirements for Service Tasks ==
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
= Volkswagen SFD, SFD2 & Service Reminder Reset (SRI) with VCDS =
 
== Overview ==
 
Volkswagen Group introduced SFD ('''Schutz der Fahrzeugdiagnose''' – Protection of Vehicle Diagnostics) in 2020 to enhance cybersecurity and control access to vehicle software. In 2024, a second layer called '''SFD2''' was introduced, requiring cryptographic validation for critical changes.
 
This page explains how VCDS interacts with SFD and SFD2 systems and provides step-by-step instructions for resetting the Service Reminder (SRI) on protected vehicles.
 
== What is SFD and SFD2? ==
 
'''SFD (v1)''' restricts coding, adaptations, and other “write” functions unless a one-time unlock token is used. VCDS supports this system using a manual token entry method.
 
'''SFD2 (v2)''' is used in 2024+ vehicles and protects specific data changes using encrypted, per-operation validation. SFD2 requires Volkswagen’s online infrastructure and is currently unsupported by VCDS.
 
SFD and SFD2 do '''not''' block:
* Reading fault codes (DTCs)
* Viewing live data (Measuring Blocks)
* Performing an Auto-Scan
 
== How VCDS Works with SFD ==
 
VCDS supports SFD by:
* Detecting SFD-protected modules
* Displaying the module's challenge string
* Allowing manual entry of the corresponding unlock token
 
VCDS does not generate or request unlock tokens itself. Tokens must be obtained separately and are valid for:
* One module only
* One session (approximately 90 minutes)
 
'''SFD2 is not supported by VCDS.'''
 
== Manual Unlock Process in VCDS ==
 
# Open VCDS and connect to the module
# Attempt a function (e.g., Adaptation or Security Access)
# Copy the displayed challenge string
# Submit the challenge to a trusted token provider
# Paste the returned release token into VCDS
# The module unlocks for ~90 minutes
 
== Resetting the Service Reminder (SRI) ==
 
=== Vehicles Without SFD (Pre-2020) ===
 
Older vehicles do not require SFD unlocks. 
→ [https://www.ross-tech.com/vcds/tour/sri-reset.php SRI Reset Tour Page]
 
=== Vehicles With SFD ===
 
Some newer vehicles (e.g., Golf 8, ID.4) have SFD in:
* '''17-Instruments'''
* '''5F-Infotainment'''
 
Steps:
# Retrieve the challenge string in VCDS
# Obtain and enter the unlock token
# Perform the SRI reset within the 90-minute window
 
=== Vehicles With SFD2 / Gateway Filtering ===
 
Newer platforms may also use a diagnostic filter in '''19-Gateway'''.
 
Steps:
# Retrieve and unlock 19 using a token
# In 19, go to Adaptation and set: 
  <code>DE16611 – Diagnosis filter: temporary deactivation → not active</code>
# This disables the diagnostic filter for ~20 km
# Unlock 5F (or other protected modules) using tokens
# Perform the SRI reset
 
<span style="color:orange;"><b>Tip:</b> While in R-Mode, you can collect challenge strings for both 19 and 5F and request both tokens at once.</span>
 
== SFD Requirement Matrix for SRI Reset ==


{| role="presentation" class="wikitable" style="background:lightgray; text-align:center; width:99%;" border="0"
{| role="presentation" class="wikitable" style="background:lightgray; text-align:center; width:99%;" border="0"
|-
|-
! Service Task !! Vehicles Without SFD !! SFD in 17-Instruments<sup>1</sup> !! SFD in 5F-Infotainment<sup>2</sup> !! SFD2 Gateway Filter<sup>3</sup>
! Service function !! Vehicles Without SFD !! SFD in 17-Instruments !! SFD in 5F-Infotainment !! SFD2 Gateway Filter
|-
|-
! SRI (Service Reminder) Reset
! SRI (Service Reminder) Reset
| style="background:limegreen" | Just perform SRI reset || style="background:orange" | Unlock SFD in 17 first || style="background:orange" | Unlock SFD in 5F first || style="background:red" | Unlock Gateway (19), then unlock 5F
| style="background:limegreen" | Just perform SRI reset || style="background:orange" | Unlock 17 first || style="background:orange" | Unlock 5F first || style="background:red" | Unlock 19, then unlock 5F
|-
|-
! Is SFD Unlock Required?
! Is SFD Unlock Required?
Line 22: Line 110:
|-
|-
! Can You Save Adaptation Values?
! Can You Save Adaptation Values?
| style="background:limegreen" | Yes || style="background:orange" | Yes, after unlocking 17 || style="background:orange" | Yes, after unlocking 5F || style="background:red" | Unlock 19 to disable filter, then unlock needed module(s)
| style="background:limegreen" | Yes || style="background:orange" | Yes, after unlocking 17 || style="background:orange" | Yes, after unlocking 5F || style="background:red" | Unlock 19 to disable filter, then unlock other modules
|}
 
<sup>1</sup> 17 – Instrument Cluster 
<sup>2</sup> 5F – Infotainment / MMI 
<sup>3</sup> 19 – CAN Gateway with SFD2 diagnostic filtering
 
== NIx Coding Index Table ==
 
Some vehicles contain a PR code indicating cybersecurity level:
 
{| class="wikitable"
|-
! NIx Index !! Cybersecurity Protection !! Software Update Protection !! SFD2 Gateway Present?
|-
| NI0 || No || No || No
|-
| NI1 || Yes || Yes || No
|-
| NI7 || Yes || No || No
|-
| NI8 || No || No || Yes
|-
| NI9 || Yes (non-UNECE markets) || Yes (non-UNECE markets) || No
|}
|}


<sup>1</sup> 17 – Instruments: Cluster, warnings, service interval
== Factory Tool vs VCDS Comparison ==
<sup>2</sup> 5F – Infotainment / Information Control Unit 
 
<sup>3</sup> 19 – CAN Gateway with SFD2 diagnostic filter
{| class="wikitable"
! Feature !! ODIS (Factory Tool) !! VCDS
|-
| Token Handling || Online and automatic || Manual (offline)
|-
| Backend Access || Yes || No
|-
| Lockout Behavior || Immediate logout or session close || Timeout (~90 minutes)
|-
| Token Source || VW Dealer Portal || Third-party vendor
|}
 
== Related Control Module Addresses ==
 
* '''17 – Instruments''': Cluster, odometer, service interval
* '''5F – Infotainment''': MMI, media interface
* '''19 – Gateway''': Network access, diagnostic filter
 
== Resources ==
 
* [https://www.ross-tech.com/vcds/tour/sri-reset.php SRI Reset Tour]
* [https://www.ross-tech.com/vcds/tour/adaptations.php Adaptations Function Tour]
* [https://forums.ross-tech.com/ Ross-Tech Forums]
 
<span style="color:#d93025;"><b>Note:</b> If readiness or service reset functions fail, ensure the engine control unit software is up to date and that a full OBD drive cycle has been completed.</span>

Revision as of 18:28, 30 July 2025

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Volkswagen SFD, SFD2 & Service Reminder Reset (SRI) with VCDS

Overview

Volkswagen Group introduced SFD (Schutz der Fahrzeugdiagnose – Protection of Vehicle Diagnostics) in 2020 to enhance cybersecurity and control access to vehicle software. In 2024, a second layer called SFD2 was introduced, requiring cryptographic validation for critical changes.

This page explains how VCDS interacts with SFD and SFD2 systems and provides step-by-step instructions for resetting the Service Reminder (SRI) on protected vehicles.

What is SFD and SFD2?

SFD (v1) restricts coding, adaptations, and other “write” functions unless a one-time unlock token is used. VCDS supports this system using a manual token entry method.

SFD2 (v2) is used in 2024+ vehicles and protects specific data changes using encrypted, per-operation validation. SFD2 requires Volkswagen’s online infrastructure and is currently unsupported by VCDS.

SFD and SFD2 do not block:

  • Reading fault codes (DTCs)
  • Viewing live data (Measuring Blocks)
  • Performing an Auto-Scan

How VCDS Works with SFD

VCDS supports SFD by:

  • Detecting SFD-protected modules
  • Displaying the module's challenge string
  • Allowing manual entry of the corresponding unlock token

VCDS does not generate or request unlock tokens itself. Tokens must be obtained separately and are valid for:

  • One module only
  • One session (approximately 90 minutes)

SFD2 is not supported by VCDS.

Manual Unlock Process in VCDS

  1. Open VCDS and connect to the module
  2. Attempt a function (e.g., Adaptation or Security Access)
  3. Copy the displayed challenge string
  4. Submit the challenge to a trusted token provider
  5. Paste the returned release token into VCDS
  6. The module unlocks for ~90 minutes

Resetting the Service Reminder (SRI)

Vehicles Without SFD (Pre-2020)

Older vehicles do not require SFD unlocks. → SRI Reset Tour Page

Vehicles With SFD

Some newer vehicles (e.g., Golf 8, ID.4) have SFD in:

  • 17-Instruments
  • 5F-Infotainment

Steps:

  1. Retrieve the challenge string in VCDS
  2. Obtain and enter the unlock token
  3. Perform the SRI reset within the 90-minute window

Vehicles With SFD2 / Gateway Filtering

Newer platforms may also use a diagnostic filter in 19-Gateway.

Steps:

  1. Retrieve and unlock 19 using a token
  2. In 19, go to Adaptation and set:
 DE16611 – Diagnosis filter: temporary deactivation → not active
  1. This disables the diagnostic filter for ~20 km
  2. Unlock 5F (or other protected modules) using tokens
  3. Perform the SRI reset

Tip: While in R-Mode, you can collect challenge strings for both 19 and 5F and request both tokens at once.

SFD Requirement Matrix for SRI Reset

1 17 – Instrument Cluster 2 5F – Infotainment / MMI 3 19 – CAN Gateway with SFD2 diagnostic filtering

NIx Coding Index Table

Some vehicles contain a PR code indicating cybersecurity level:

NIx Index Cybersecurity Protection Software Update Protection SFD2 Gateway Present?
NI0 No No No
NI1 Yes Yes No
NI7 Yes No No
NI8 No No Yes
NI9 Yes (non-UNECE markets) Yes (non-UNECE markets) No

Factory Tool vs VCDS Comparison

Feature ODIS (Factory Tool) VCDS
Token Handling Online and automatic Manual (offline)
Backend Access Yes No
Lockout Behavior Immediate logout or session close Timeout (~90 minutes)
Token Source VW Dealer Portal Third-party vendor

Related Control Module Addresses

  • 17 – Instruments: Cluster, odometer, service interval
  • 5F – Infotainment: MMI, media interface
  • 19 – Gateway: Network access, diagnostic filter

Resources

Note: If readiness or service reset functions fail, ensure the engine control unit software is up to date and that a full OBD drive cycle has been completed.

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