A method and control unit for configuring an add-on interface of a vehicle are presented. The vehicle comprises at least one vehicle internal system, at least one add-on system, the add-on system being arranged in the vehicle after the vehicle is produced by a manufacturer, and at least one internal communication unit arranged for communication with at least one vehicle external communication unit. The method comprises: receiving, using the at least one internal communication unit, configuration information related to at least one sensor of the vehicle from the at least one vehicle external communication unit; and configuring, based on the configuration information, how at least one sensor signal Ssensor from the at least one sensor is to be processed by an add-on interface, the add-on interface being arranged in the vehicle as an interface between the at least one vehicle internal system and the at least one add-on system.