Can anyone help me i own a 03 tdci mondeo which i have had break down thsi week but no-one can seem to tell me whats up with it. I had a bad patch of desiel which i emptied out and put fresh in but now it won`t start off the key and when you tow it it starts but smokes really bad and also the knocking from the engine is really loud can anyone help as been told it could be th knocking sensor but i`m not sure where this is on my car can anyone help with the location on my car please.