Does anyone know the meaning of fault code 1230 for the Simtec 56.5 engine management system? - It doesn't seem to be listed on any of the websites that I've found so far. It's an X20XEV engine in the Vectra SRi140 (1998). Fault symptoms are engine cut out after driving anywhere between 6 and 20 miles. Will not restart immediately, but will restart after around 2-3 minutes. TIA! Andy Clarke