Door control units - Highline for Audi A4 8W In some cases, the door control units must be replaced during installation: Lane change assistant Folding exterior mirrors Please contact a local Audi dealer for replacement of the on-board control unit Connect the vehicle to the Audi diagnostic tool - Current codes must be copied to the new control unit - After replacement, the component protection must be removed (online connection required) Scope of delivery: Front left door control unit Front right door control unit