Audi A4 B9 Coding List [2021] Jun 2026

| 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 |

Long Coding -> Byte 2 -> Activate Bit 7 (or search Adaptation for Tagfahrlicht-Dauerfahrlicht aktiviert mit Heckleuchte ). Disable Amber Side Markers (US Models Only) audi a4 b9 coding list

Always perform a full system scan and backup before changing any values. | Function | Byte-Bit Change | Effect |

Fog lights illuminate when you turn the steering wheel at low speeds. audi a4 b9 coding list