[EwanR]

Hi Haggis

Sorry to hear about your problems. Bit puzzled why you bought the car if it had this problem - however that's another discussion point.

Regards your car and the dealer if the car was running when you took it in, it should be no worse when you get it back. I doubt the ECU would have an effect on your judder problem.

One of the difficulties with "forum diagnosis" is getting an accurate description of whats going on and in this case the juddering you mention is not well enough defined.

Any number of faults can cause a car not to start these days. One sensor wire disconnected can do it.

Be firm with the dealer. Tell them you want the car back in a running condition at no expense to you. If you only asked them to diagnose and not fix - they should do this. If they won't, threaten them with a nasty letter to Renault HQ informing then how bad the dealers service is. Then move on to legal action if that doesn't work.

Which dealer was it - so others don't get caught out!

Regards

ER