Audi A4 B9 Coding List May 2026
Audi A4 B9 coding list
Unlock Tailgate Independently
Allows you to open the trunk without unlocking the whole car.
- Module: 05 Access/Start Auth
- Function:
Enabling_Heckdeckel(Enable Tailgate) - Tweak: Set to "Single lock" (opens on first press) or adjust to "Double press required."
🔧 1. Lighting Modifications
The Verdict: Essential, but Technical
Rating: 8/10 (for the data availability) | Difficulty: 7/10 (for the execution)
The "Audi A4 B9 Coding List" is an essential resource for any owner wanting to modernize their vehicle or unlock hidden features without paying dealer prices. However, it is not a "plug-and-play" solution. It requires specific hardware, patience, and a willingness to accept some risk. audi a4 b9 coding list
Part 6: The B9.5 (Facelift 2020+) Differences
If you have a 2020+ A4 B9.5 (with the honeycomb grille and touchscreen MMI), note these changes:
- Module 5F is gone: It is now integrated into the J794 (Infotainment Main Unit) . Coding is stricter due to SFD (Security Onboard Diagnostic Protection).
- SFD Unlock: You need a dealer account or a tool like OBD11 with credits to unlock protected functions.
- Video in Motion (VIM) is nearly impossible without hardware modules because the speed signal is hard-coded into the GPS unit.
- Lap Timer still works the same (Module 17).
Module 08 – HVAC (Air Conditioning)
Specifically for North American cars that lack the "OFF" button logic. Audi A4 B9 coding list Unlock Tailgate Independently
| Feature | Adaptation Channel | Value / Change | Notes |
| :--- | :--- | :--- | :--- |
| OFF button turns fan completely off | (4)-Off_Button | Change to Active | Allows single press to kill air completely. |
| Rest Mode (Residual Heat) | (6)-Rest_Button | Change to Active | Keeps fan blowing engine heat after engine off. |
8. Module A5 – Front Camera (Driver Assist)
Access: [A5] → Coding
| Function | Modification | Effect | |----------|--------------|--------| | Lane Assist default to “Last Setting” | Byte 12, Bit 0 = 1 | Lane assist stays off/on as last used, not reset at ignition | | Early warning for Pre-sense | Byte 7, Bit 2 = 1 | Increases sensitivity of collision warning |