This cable is "full-function" for most VAG vehicles made before they switched to the CAN-bus system (roughly 2004–2005). Volkswagen (VW): Compatible:
Most SEAT models are mechanically identical to VW, so the same rules apply. kkl vag com 409.1 car list
Because the KKL VAG-COM 409.1 is a K-Line interface, its compatibility is strictly limited to vehicles that do not utilize CAN-Bus for diagnostics. This cable is "full-function" for most VAG vehicles