Specific wiring for retrofitting the original swivel trailer hitch for Audi A6, A7 4G all functions as installed ex-factory Selectable option: up to model year 2014 from model year 2015 Scope of delivery: cable set Notes: After installation, the control equipment must be coded Example towbar 4G0800491Q (PR-Nr.: 1BA, 1BE, 1BV, 1BR), 4G0800491R (PR-Nr.: 2MB, 1BS, 1BK) Suitable control unit 4G8907383 up to model year 2014, 4G8907383B from model year 2015