EGR Code

[Chuckweasel]

Have a P0401 EGR code. Has been too cold to work on it. Have put about 1,000 miles on with CEL lit. Any chance I am doing damage (cat?) waiting for warmer weather?

Thanks
Chuckweasel

 

[ThreePointO]

It's probably your DPFE sensor... it takes about ten minutes to swap in a new one.

 

[betomonroy]

Unless you're affraid to freeze your silky smooth feel like a princess butt hands.

 

[nort]

code po401

Hi, I just got done testing my dpfe sensor and it is easy. you need a volt meter and a vacumm source such as a hand pump. My truck is a 94 but it might be the same sensor. Mine was 2 yrs old and I was getting code 332 no egr flow detected. You put vacumm pump on the reference signal port and use a pin to attach volt meter to top wire on plug. turn key on voltage should be around 4.5 to 5 volts under vacumm and drop to a low vlaue when vacumm is released. I researched dpfe sensors and found that metal units apparently are suspectable to corrosion from condensation. I think thats what munged up my original one. That said, Its a 50.00 or so part and quick to change if you want to take a shot and throw money at it. I tested all my egr system and now I think my ecu took a bullet from a 12v feedback. Just as a word of caution. The test equipment is a small investment compared to misdiagnosis and parts replacement. The egr system can be plugged with carbon, valve itself is possibly stuck, solenoids shorted or open.