KUFATEC Diagnostic Interface: Interface for final coding. If original LED headlights were later installed on the VW Arteon 3H, this interface is suitable for retrofitting headlights with cornering lights (DLA). Simply connect the adapter (dongle) to the vehicle's OBD interface – that's it! The interface automatically adapts the retrofit to the existing vehicle coding. Selectable options: from model year 2021 to model year 2020. Scope of delivery: coding key. Note: The diagnostic interface can only be used for one vehicle.