I had the check engine light come on, and it was code P0400, EGR problem. I had another used EGR valve, replaced it but the light came back on. I replaced the EGR boost sensor (new), didn't fix it. I then replced the MAP sensor, again, no luck. I could not find any other components pertaining to the EGR system, so I replaced the EGR valve with a new one. Light came back on. I did run a wire through the egr exhaust port in the head, and didn't find any blockage (however I could only go so far and I'm not sure I got all the way through).
Is there any other component or test I should make that I'm missing?
have the same problem?
Friday, November 2nd, 2007 AT 6:46 PM