Audi A4 B9 Coding List -

| Function | Byte-Bit Change | Effect | |----------|----------------|--------| | Auto unlock when key removed | Byte 2, Bit 2 = 1 | Doors unlock automatically upon ignition off + key pull | | Locking confirmation beep (unlock) | Byte 4, Bit 3 = 1 | Audible chirp on unlock (not just lock) | | Window roll-down via remote (global open) | Byte 3, Bit 0 = 1 | Enables European-style remote window drop |

Here is a review of the resources available, the tools required, and the usability of the data found within these lists. audi a4 b9 coding list

⚠️ before making changes. Use at your own risk. | Function | Byte-Bit Change | Effect |

| Module | Name | Common tweaks | |--------|------|----------------| | 01 | Engine | Start-stop off, soundaktor off | | 03 | ABS/ESP | Brake assist sensitivity (not recommended for street) | | 09 | Central Elec. | Lights, wipers, coming home, folding mirrors | | 13 | Adaptive Cruise | Lane assist early/late reaction | | 17 | Instruments | Needle sweep, lap timer, seatbelt chime | | 42/52 | Door modules | Mirror folding, window comfort | | 44 | Steering | Steering weight adjustment | | 5F | MMI | Video in motion, menu activation | | 6D | Trunk | Power trunk close from key fob | | Module | Name | Common tweaks |

Keeps your taillights on even when only DRLs are active.