thanks for the information, I have been told that it may not be the earth but it could be the crank sensor.

we have explained to them what the fault is, we've had the RAC out twice, they said it was an earth fault, RAC put a temporary wire to earth it, the garage replaced this wire. car started fine at the garage but now its the same fault again. we will give them time to fix the fault. what happens if they cant fix it. do we have to put up with it.

my dad as got a used vauxhall corsa 04 bought on the 1st september 2009, since last week it as had an intermittant fault when starting which we think is to do with the earth in the wiring loom. when a wire is pressed on the negative on the battery, then to a earthing point on the ecu this seems to make it start, but we cant be certain. it was a major garage franchise he got the car from, they have attempt one repair so far without success so we are taking it back again tomorrow. How many attempts do the garage get before you can reject the car for a refund. They have known about the fault since friday 27th Nov 2009 The garage gave my dad a 3 month warranty which runout today. thanks for any help