VAG SFD (Schutz Fahrzeug Diagnose) is a protected diagnostic access system used on newer vehicles in the Volkswagen Group. When a control unit is protected by SFD, selected diagnostic functions cannot be completed until the required authorization is obtained. This guide explains how to prepare for a VAG SFD unlock service, what information a workshop should provide, and how to reduce avoidable delays.
What is VAG SFD protection?
SFD adds an authorization step to protected workshop operations. The exact protected functions vary by vehicle, model year, software level and control unit. An unlock does not automatically perform a repair or coding operation; it provides the authorized diagnostic access required before an eligible operation can continue.
When may an SFD unlock be required?
A workshop may encounter SFD protection while carrying out guided diagnostics, coding, adaptations, basic settings or other protected functions. Because coverage differs between vehicles and modules, the vehicle identification number, control-unit details and intended job should be checked before ordering.
How the SFD token service works
The service is used by purchasing an SFD token. The required SFD calculation can then be completed through the web-based mobile PWA or through the Windows desktop application. This gives workshops the flexibility to use the service from a mobile device or from the diagnostic computer, depending on the working environment.
Supported VAG brands
The SFD token service can be used for VAG vehicles from the following supported brands:
- Volkswagen
- Audi
- Škoda
- SEAT
- Bentley
Volkswagen SFD Unlock
Volkswagen SFD Unlock is available through the token workflow for supported Volkswagen vehicles. Confirm the VIN, model year, protected module and intended diagnostic function before calculating the token.
Audi SFD Unlock
Audi SFD Unlock uses the same web/mobile PWA or Windows desktop application workflow. The technician should identify the exact Audi control unit and protected operation before using a token.
Škoda SFD Unlock
Škoda SFD Unlock is supported for eligible Škoda vehicles. Verify vehicle communication and keep the full ODIS message available when the protection type or module is uncertain.
SEAT SFD Unlock
SEAT SFD Unlock can be calculated with a purchased token through the supported application. Stable vehicle voltage, internet and VCI communication remain essential throughout the workshop operation.
Bentley SFD Unlock
Bentley SFD Unlock is available for supported Bentley vehicles in the VAG token system. Because vehicle and module configurations can differ, provide the complete identification and requested function before starting.
Information to prepare before ordering
- Vehicle make, model and model year
- VIN or the vehicle information requested by the technician
- The control unit or module involved
- The exact operation you want to perform
- A clear diagnostic report or screenshots of the displayed message
- The diagnostic interface and ODIS environment available in the workshop
Do not send passwords or unrelated personal information in public messages. Vehicle and workshop details should only be shared through the order or support channel requested for the job.
Workshop preparation checklist
- Use a stable Windows computer with current diagnostic-interface drivers.
- Connect the laptop to power and disable sleep during the operation.
- Use a stable internet connection; avoid changing networks during the session.
- Maintain the vehicle voltage with a suitable workshop battery support unit.
- Connect a compatible VCI directly and confirm that ODIS can identify the vehicle.
- Close unnecessary programs and postpone operating-system restarts or updates.
- Keep the vehicle available until the diagnostic operation and final scan are complete.
SFD and SFD2 are not interchangeable
The protection present on the vehicle must be identified before the service is selected. A service intended for an SFD-protected operation should not be assumed to cover every SFD2 vehicle or function. If you are unsure, send the VIN, affected module and diagnostic screen so compatibility can be checked first.
What an unlock does not guarantee
An SFD unlock cannot correct damaged hardware, unstable vehicle voltage, incompatible software, missing parameter data or an incorrect repair procedure. After access is available, the requested operation still needs to be technically valid for the vehicle. Faults should be diagnosed rather than repeatedly cleared or coded without a repair plan.
Responsible and authorized use
SFD-related services are intended for legitimate vehicle owners and professional workshops carrying out authorized repair work. Proof of ownership, customer authorization or additional vehicle information may be requested. The service must not be used to conceal vehicle identity, bypass anti-theft protections or perform an unauthorized modification.
Requesting VAG SFD assistance
Before ordering, identify the vehicle, module and required operation. You can review the available VAG SFD Unlock service. For newer protection systems, see the separate VAG SFD2 Unlock service. Contact support when the correct service is unclear.
Frequently asked questions
How do I use the SFD service?
Purchase an SFD token and use the web-based mobile PWA or the Windows desktop application to complete the supported calculation.
Should I order before checking compatibility?
If the protection type, module or operation is uncertain, contact support with the vehicle and diagnostic details before ordering.
Do I need stable battery voltage?
Yes. Diagnostic, coding and programming work should be performed with appropriate workshop battery support according to the vehicle and OEM procedure.