Please help i am new to this site but it looks like you lot know what you are taking about, so here goes, i have read various threads on here but i have come to a dead end. the car in question is a merc E320 CDi Estate 53 plate. when you try to start it, you turn the key to position 2 and the engne fan starts running flat out and the dash says ESP malfunction but turning on to position 3 the starter does not operate. i am not too concerned with the ESP because i imagine this error is a side effect of power problems because it clears if the car starts? the garage think it is the key and ignition system but i think not because all systems are accessable except engine start. one thread on here mentioned something to do with relays and bad earths causing a canbus error, any info or suggestions would be welcome. the car still starts after about 15 to 20 trys but i am worried it will let me down completely soon. 
