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| = WARNING: RESTRICTED ACCESS =
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| Your attempt to access this page is considered UNAUTHORIZED!
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| '''ERROR 401: UNAUTHORIZED'''
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| Your IP address has been logged.
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| ------------------------------------------------------------
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| = Volkswagen SFD, SFD2 & Service Reminder Reset (SRI) with VCDS =
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| == Overview ==
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| 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.
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| 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.
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| == What is SFD and SFD2? ==
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| '''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.
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| '''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.
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| SFD and SFD2 do '''not''' block:
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| * Reading fault codes (DTCs)
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| * Viewing live data (Measuring Blocks)
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| * Performing an Auto-Scan
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| == How VCDS Works with SFD ==
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| VCDS supports SFD by:
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| * Detecting SFD-protected modules
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| * Displaying the module's challenge string
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| * Allowing manual entry of the corresponding unlock token
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| VCDS does not generate or request unlock tokens itself. Tokens must be obtained separately and are valid for:
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| * One module only
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| * One session (approximately 90 minutes)
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| '''SFD2 is not supported by VCDS.'''
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| == Manual Unlock Process in VCDS ==
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| # Open VCDS and connect to the module
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| # Attempt a function (e.g., Adaptation or Security Access)
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| # Copy the displayed challenge string
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| # Submit the challenge to a trusted token provider
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| # Paste the returned release token into VCDS
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| # The module unlocks for ~90 minutes
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| == Resetting the Service Reminder (SRI) ==
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| === Vehicles Without SFD (Pre-2020) ===
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| Older vehicles do not require SFD unlocks.
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| → [https://www.ross-tech.com/vcds/tour/sri-reset.php SRI Reset Tour Page]
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| === Vehicles With SFD ===
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| Some newer vehicles (e.g., Golf 8, ID.4) have SFD in:
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| * '''17-Instruments'''
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| * '''5F-Infotainment'''
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| Steps:
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| # Retrieve the challenge string in VCDS
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| # Obtain and enter the unlock token
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| # Perform the SRI reset within the 90-minute window
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| === Vehicles With SFD2 / Gateway Filtering ===
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| Newer platforms may also use a diagnostic filter in '''19-Gateway'''.
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| Steps:
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| # Retrieve and unlock 19 using a token
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| # In 19, go to Adaptation and set:
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| <code>DE16611 – Diagnosis filter: temporary deactivation → not active</code>
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| # This disables the diagnostic filter for ~20 km
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| # Unlock 5F (or other protected modules) using tokens
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| # Perform the SRI reset
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| <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>
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| == SFD Requirement Matrix for SRI Reset ==
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| {| role="presentation" class="wikitable" style="background:lightgray; text-align:center; width:99%;" border="0"
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| |-
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| ! Service function !! Vehicles Without SFD !! SFD in 17-Instruments !! SFD in 5F-Infotainment !! SFD2 Gateway Filter
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| |-
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| ! SRI (Service Reminder) Reset
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| | 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
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| |-
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| ! Is SFD Unlock Required?
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| | style="background:limegreen" | No || style="background:orange" | Yes || style="background:orange" | Yes || style="background:red" | Yes in 19 and 5F
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| |-
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| ! Can You Save Adaptation Values?
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| | 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
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| |}
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| <sup>1</sup> 17 – Instrument Cluster
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| <sup>2</sup> 5F – Infotainment / MMI
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| <sup>3</sup> 19 – CAN Gateway with SFD2 diagnostic filtering
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| == NIx Coding Index Table ==
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| Some vehicles contain a PR code indicating cybersecurity level:
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| {| class="wikitable"
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| |-
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| ! NIx Index !! Cybersecurity Protection !! Software Update Protection !! SFD2 Gateway Present?
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| |-
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| | NI0 || No || No || No
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| |-
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| | NI1 || Yes || Yes || No
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| |-
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| | NI7 || Yes || No || No
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| |-
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| | NI8 || No || No || Yes
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| |-
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| | NI9 || Yes (non-UNECE markets) || Yes (non-UNECE markets) || No
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| |}
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| == Factory Tool vs VCDS Comparison ==
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| {| class="wikitable"
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| ! Feature !! ODIS (Factory Tool) !! VCDS
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| |-
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| | Token Handling || Online and automatic || (still in development)
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| |-
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| | Backend Access || Yes || (still in development)
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| |-
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| | Lockout Behavior || Immediate logout or session close || Timeout (~90 minutes)
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| |-
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| | Token Source || VW Dealer Portal || (still in development)
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| |}
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| == Related Control Module Addresses ==
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| * '''17 – Instruments''': Cluster, odometer, service interval
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| * '''5F – Infotainment''': MMI, media interface
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| * '''19 – Gateway''': Network access, diagnostic filter
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| == Resources ==
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| * [https://www.ross-tech.com/vcds/tour/sri-reset.php SRI Reset Tour]
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| * [https://www.ross-tech.com/vcds/tour/adaptations.php Adaptations Function Tour]
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| * [https://forums.ross-tech.com/ Ross-Tech Forums]
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| <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>
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