B9 Coding List | Audi A4

Proceed at your own risk. Incorrect coding can cause vehicle malfunctions or leave control units in a "bricked" state. Always back up your original coding (create a "VCDS Map" or save the trace file) before making changes.

| Tool | Ease of use | Cost | Best for | |------|-------------|------|-----------| | OBDeleven | Very easy (phone app) | $60–150 | Quick tweaks, beginners | | VCDS | Expert | $200–300 | Full coding, logging, retrofits | | VCP | Professional | €150+ | Advanced adaptations, parameter changes | audi a4 b9 coding list

Access: [17] → Coding

| Function | Byte-Bit Change | Effect | |----------|----------------|--------| | Lap Timer / Oil Temperature Display | Byte 1, Bit 3 = 1 | Adds performance menu (lap time, boost, oil temp) | | Gear Display (P/R/N/D/S) in non-Virtual Cockpit | Byte 1, Bit 0 = 1 | Shows current gear next to PRNDS | | Seatbelt Warning Disable (Track use only) | Byte 4, Bit 0 = 0 | Suppresses chime (illegal in many regions) | Proceed at your own risk

To code the B9 platform, you typically need one of the following: | Tool | Ease of use | Cost