P0402 6.7
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Trailering
Joined: Jan 2012
Posts: 24
Likes: 0
From: Paso Robles, CA
P0402 6.7
Have a 2012 f-250 6.7 with 165k miles. Deleted it at 75k and ran perfectly. Since I live in California the smog shop said no pass as their system can detect issue even though it was tuned back to stock and old dpf bolted back. So mechanic cleaned out def tank and lines,def sending unit, replaced egr valve, egr housing egr cooler and replaced computer. It still has P0402 code (excess egr flow) and he said he has run out of ideas to fix, any suggestions? He’s had it for 6 months. Map sensor is clean, air filter new, truck runs fine. Clear code and cel light and code comes back within 50 miles. Any suggestions? At wits end
Cross-Country
Joined: Dec 2015
Posts: 51
Likes: 46
From: SC
I would check CAC (cold side tube, no leaks cracks), next, the Exhaust Back Pressure (EBP) sensor. Also, that there are no leaks/blockages in the Air Filter / housing or the sensor.
Hotshot
Joined: Jul 2013
Posts: 14,266
Likes: 2,187
p0402 is based on changes in MAF data...as more egr flow occurs...less MAF should be happening...assuming your CCV is stock.
so when I had the code I replaced the MAF sensor and MAP and still had the code. replaced the IAT...still had the code. replaced the EBP sensor...code gone. dont know if it was a coincidence....maybe the system had to do a relearn after MAF and MAP replacement. I do know that clearning a p0402 with a scan tool does not work...its a perm code and only clears after the PCM verifies the condition is fixed.
so when I had the code I replaced the MAF sensor and MAP and still had the code. replaced the IAT...still had the code. replaced the EBP sensor...code gone. dont know if it was a coincidence....maybe the system had to do a relearn after MAF and MAP replacement. I do know that clearning a p0402 with a scan tool does not work...its a perm code and only clears after the PCM verifies the condition is fixed.
Hotshot
Joined: Jul 2013
Posts: 14,266
Likes: 2,187
i forgot to mention, the EBP takes two wrenchs to remove,,,if you try to use only one wrench..you will break the tube that the ebp connects to.
and....the ebp is on the pax side of the turbo almost in line with the hood vent area.
and....the ebp is on the pax side of the turbo almost in line with the hood vent area.
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