The last few days the engine management light on the dash sometimes doesnt light up (not the bulb) but all the others like the battery, oil, etc do when turning the ignition on. When the light shows on start up the car will start. If not it will turn over but wont start. Checked the ECU for Fault codes and there is only 12,31 which is correct. Any ideas or info on the C20 LET loom would be a great help.