Hi; Have checked all earth leads including the big one (from battery neg to gearbox casing) on the nearside, all clean and tight. My thinking is sensor input or ECU, as temp guage is full scale and fans running constantly - ECU obviously thinks engine is stinky hot so no cold start facility, which means the bloody thing will never fire in this weather. Havent checked fuel rail/pumps/heaterplugs as I figure the problem is temp guage related (but may check later on today if desperate enough lol). My main concern is have I missed a sensor out, or has the ECU defaulted/reset etc, is there a reset procedure I dont know about. I have checked for trapped/pinched wires and all looks ok, unless there is something between the IRD/bulkhead, which is very tight and cannot easily be seen. Don't really want to have to drop the box etc just to check for wires....Any ideas?