Retrofit kit for an original electric tailgate for Audi A4 8K Avant Automatic tailgate opening using: Tailgate push button Radio key with push button Driver's door button (if present) Scope of delivery: Wiring Closing device Drive Buffer Push button Note: In some cases, the comfort control must be replaced. Control units with the following index are suitable and a replacement is not necessary: ​​Part number index: Q, AQ, BQ, CQ, DQ, CS