My CEL came on sometime in August, around a month after I get my Transmission replaced (under warranty, I'm lucky). Pulled the code, P0340. Had the CPS replaced. Cleared the code. Light came on again. Same code. What do I do now?
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2002 Mercury Cougar
Question: OBD Code P0340? Again?
Answer #1mastertech6371 September 13, 2011, 07:29Master
most likely a DPFE sensor failure. Ford had issues with these sensors causing 340 code.
Replyremy2584, September 13, 2011, 07:32Rookie
Already? I had the EGR Valve replaced a year ago. Sensor should've been replaced as well.
Replymastertech6371, September 13, 2011, 07:42Master
no, it does not mean it was replaced unless you were specifically charged for it. do you have the receipt??
it is not part of the egr.
Replyremy2584, September 13, 2011, 08:14Rookie
Yes, the DPFE sensor and EGR valve were replaced.
Replymastertech6371, September 13, 2011, 08:34Master
ok, you need a shop to check this system, a good shop that can use a scanner and be able to find the malfunction. from here, it is tough to determine the failure without seeing it in person.
wish I could be more help, but it is difficult to diag from a distance.