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Old 01-05-2011, 09:43 AM
Rockslyde Rockslyde is offline
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Join Date: Dec 2010
Posts: 29
Question Not your Ordinary P0401 thread

Alrighty, so i go to get my oil changed, and about two blocks after i leave Valvoline the check engine light comes on. Hmm no biggie, once i get home i'll pull the codes, and if it's oil related i'll go back and have talk to them about it.

Well it's P0401 and P0402. After a bit of research i notice that it's the DPFE sensor for the most part. Being after christmas and all, i figure i can wait a week till payday to pick up the new part since i only drive about 50 miles all week.

I get in the Bessy to go to work, and low and behold the Check Engine light has gone off. Through all of this the truck ran just fine. I'm wondering if maybe it was an environmental issue, I say this because i live in WI, and last Wednesday thru Friday we had basicly a rapid thaw that created quite the fog as we were at 110% humidity. The light came on thursday (peak of fogginess/Humidity) and went away monday (Didn't drive it sunday as i was in GB for the game). We went from 40/50 degree weather to the 10s.

My question is could the humidity in the air caused the sensor to trip or more likely water to get into the egr/ DPFE, and the rapid freezing to cause that water to freeze making everything seem right
And should i just change the DPFE anyways just to be safe?
Thoughts, questions?
1998 XLT 2WD
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