I've replaced the Tod computer already and the speed sensors underneath not at the wheels. I've read the codes by putting the wire in pin 8 which gave me code 13 which in your cases would mean shorted ground but I'm now wondering whether this could relate to the oxygen sensor as on other sites I've found listings refering to code 13 being oxygen sensor. Other than the Tod light flashing, it's using excessive fuel, smells really hot when I get out of it and it says it's idling low once warm although it's not stalling or juddering or anything. It is OBD II compatable but nowhere here can read the codes.