my engine management light keeps coming on. i keep checking for the fault and everytime comes up the code po400 so i was told to clean egr valve but i can't locate it. has my car got one?. someone told me that maybe i have not got one and it might be the oil preasure switch but if that was the problem i would have thought that would be a different code please can you help me
Jun 15, 2013 at 5:57 AM