This dongle is for VW Canbus Systems which greatly increases the success rate for VW on model years 2007-2014 OBD2 programming. Use this dongle if Zed-Full says unrecognized seed, unknown cluster, or various other error messages.** In the event Zed-Full fails to recognize system while the dongle is plugged in, simply unplug the dongle and repeat programming protocol with no dongle present. This dongle should eliminate 25-50% of error messages present during VW Canbus OBD2 programming. **** This will assist in 2007-2010 VW Canbus System all keys lost & duplication via OBD2 programming and 2011-2014 duplication only via OBD2 programming. **