Running a P0401
#1
#2
If i remember right the code pulled 10 months ago was a Po402, which i did replace the DPFE sensor, if i remember correctly, the code read ExcessiveFlow or something, would this still be affected by my DPFE, if so couldnt I just clean it and with what?
Last edited by Trigger; 05-28-2008 at 11:49 PM.
#3
P0401 and P0402 are usually caused by incorrect DPFE voltage to the PCM. Sometimes the DPFE is permanently damaged, sometimes it just has condensation inside. I would try a quick fix by removing it, shaking out the water and letting it dry overnight with the hoses off and the DPFE ports facing down.
DPFE's live in the harsh environment of the exhaust gas stream. The OE part doesn't last forever. Some of the aftermarket parts seem to be even less durable.
DPFE's live in the harsh environment of the exhaust gas stream. The OE part doesn't last forever. Some of the aftermarket parts seem to be even less durable.
#5
I tried cleaning it, there was moisture in the hoses, so i took of the sensor for the night but after i hooked it all back together the check engine light came on again after a couple miles, any other suggestions? Also, i hear that you should replace the egr along with the dpfe which im thinking about doing, what does the egr look like and where is it located on a 4.0?
Last edited by Trigger; 06-03-2008 at 12:06 AM. Reason: added stuff
#6
I tried cleaning it, there was moisture in the hoses, so i took of the sensor for the night but after i hooked it all back together the check engine light came on again after a couple miles, any other suggestions? Also, i hear that you should replace the egr along with the dpfe which im thinking about doing, what does the egr look like and where is it located on a 4.0?
#7
#9
Rich, can they send the parts to my address?
And you guys dont think i should change the EGR, being that I just changed the DPFE last fall, and I heard from searching this forum that people say when the DPFE goes bad the EGR is also probably bad.
EDIT*
Just took off the sensor again when i got home, there was again moisture in it, Now i dont know but this morning the check engine light went off by itself, then about 7 hours later next time i drove, it popped up again, is there anyway to stop the moisture buildup?
And you guys dont think i should change the EGR, being that I just changed the DPFE last fall, and I heard from searching this forum that people say when the DPFE goes bad the EGR is also probably bad.
EDIT*
Just took off the sensor again when i got home, there was again moisture in it, Now i dont know but this morning the check engine light went off by itself, then about 7 hours later next time i drove, it popped up again, is there anyway to stop the moisture buildup?
Last edited by Trigger; 06-05-2008 at 11:29 PM.
#10
Trigger, Mines doing the same thing. I've replaced the DPFE 4 times in the last 2 years. Replaced the Hoses also. Still every time the 401 pops up the DPFE and hoses are wet. I'm replacing the whole upper intake to a composite. They have NO egr system at all.
Therefore NO DPFE to mess with. I'm still trying to found out how to lose the CEL now since I have NO egr. My PCM is still for an '01 and is trying to read a signal for the egr. Should have the '04 Upper on in a couple of weeks. Hopefully by then I'll have the answers.
Therefore NO DPFE to mess with. I'm still trying to found out how to lose the CEL now since I have NO egr. My PCM is still for an '01 and is trying to read a signal for the egr. Should have the '04 Upper on in a couple of weeks. Hopefully by then I'll have the answers.
#11
You can't stop moisture from forming in the exhaust because H2O is one of the two major products of combustion of any hydrocarbon fuel.
#14
The DPFE lives in an exhaust stream that contains a large percentage of H20. You cannot eliminate the water condensation, so the DPFE has to deal with it.
#16
Could be:
dry-rotted hoses TO the DPFE
corroded or perforated EGR tubes that the DPFE hoses connect to
Personally, my tack is to buy the DPFE at AutoZone, keep the receipt. When the code comes back in 4 months or so, have them read out the code and use their 2 year Warranty.
Carquest only warranteed it for one year, one time free replacement, which I used. We'll see how good AutoZone honors their warranty when this one (#4 including original) goes south on me. It was a Tomco brand. http://www.tomco-inc.com/EGR_Delta_P...nsor_9066.aspx
dry-rotted hoses TO the DPFE
corroded or perforated EGR tubes that the DPFE hoses connect to
Personally, my tack is to buy the DPFE at AutoZone, keep the receipt. When the code comes back in 4 months or so, have them read out the code and use their 2 year Warranty.
Carquest only warranteed it for one year, one time free replacement, which I used. We'll see how good AutoZone honors their warranty when this one (#4 including original) goes south on me. It was a Tomco brand. http://www.tomco-inc.com/EGR_Delta_P...nsor_9066.aspx
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