asmair you are having trouble finding an OBD2 decoder because your car doesn't have an OBD2 port. It is however possible to access the ECU using the diagnostic link - see thread here.

BuyBritish of this parish has a T16 +4 and may be able to help as well if you PM him.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone