PO 401 Code

[delcogod]

Sets daily, or every other day. Have re-replaced the dpfe, and the valve above it. Idled engine, sucked on egr valve and it stumbled like I think its supposed to. Had this problem about a year ago. Changed everything in the egr system including the o2 sensors and cat. What next?

 

[snake]

Where'd U buy the DPFE? If it wasn't a motorcraft, it has probably failed again. There are some tests you can perform on the egr parts, found it doing a search online. Although I forget what I searched for exactly, so I guess I'm a big-ass help, right?

 

[delcogod]

Autozone for the DPFE cuz it was a free warranty replacement. Since I live in northeast Ohio (born and raised in the South) and the bellows of the egr valve is exposed to salt spray in the winter, I'm hoping the suck and blow excercise might have helped. Ran fine today.

 

[jonenitro]

i had same problem with a 2002 explorer sport trac i changed the dpfe sensor with a autozone one 3 months later light came back on replaced with oem ford unit cost me $83 versus the 35 at autozone light never came back on part number dpfe-4 sensor part # 4u7z-9j460-aa dealer needed vin said it was calibrated to vehicle vin hope this helps

 

[jasonl]

Auto zone must be selling the old ford part number as they failed about every 6 months also.

 

[delcogod]

Thanks for the advice. Ford quoted $135 for a new one and since I just swapped the old one at Autozone, I'll wait for it to fail again. I did find a problem with vaccum lines. Inside diameter was the same on both even though one was was bigger outside diameter. I even mic'd them. So the dpfe was never sensing an egr difference. NJow I have to just wait and see.