This OBD interface activates the advanced key, Kessy function in the BCM2 comfort control unit in the Audi A6, A7 4G For retrofitting or recovery Simply connect the adapter to the vehicle's OBD port - done! The coding adapter adapts retrofitted parts fully automatically to the vehicle's existing coding Scope of delivery: 1x coding dongle Note: The comfort control unit must be replaced by a Highline version