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stock 06, 125k, CEL p0402, replaced EGR valve and sensor, what now?
hello and thanks for viewing, I recently purchased my first Ford. I am counting myself fortunate to have found this 06 KR in good shape for $20k. However I have spent about $350 on a new EGR valve and a new DPFE sensor / EGR valve position sensor, or whatever you call that thing, only to have the CEL keep coming back on. I have scanned the code p0402 for excessive egr flow. Unfortunately I threw away the old EGR valve which was probably still good. When I pulled it out there was only moderate soot build up and there was NO gooey or oily residue. The truck does NOT blow any smoke, except when I first test drove it, and after replacing the EGR valve as it was blowing soot out for a minute. I have replaced the factory coolant cap as a precaution and when money permits I will install a coolant filter.
I am stumped on this CEL and am looking for any help anyone on here can offer, thank you for reading.
EDIT: I have noticed now that there is a light haze of black smoke when I step on it. More noticeable when the CEL is on.
2006 F350 KR CC SWB 4X4 6.0 125k -- Cat&Muffler Delete, EGR Spool, Torque on Dedicated Android.
2000 Subaru Outback 165k
1994 Chevy Blazer Sport 170k
Last edited by BlazerOutback Powerstroke; 01-20-2013 at 04:45 PM.