I got a PO401 Code reading today from AutoZone.

Engine was running sluggish while cold. I read about cleaning the IAC from other posts on this board, so I did that and the sluggishness (is that really a word) has cleared up. However, CEL is still on, so I got the codes read today.

The PO401 code refers to the EGR valve. Any suggestions on how to deal with this issue? The car is running great, but I want to get rid of the CEL so that I feel the problem has been addressed.

Also, I've noticed references to the DPFE Sensor? What is that?

Any help is appreciated.

Replace the DPFE sensor for a P0401 code. I had it done under warranty in my '01 Windstar. Here's one link:

http://vcertt.org/news/10-03.pdf

And another:

http://rockledge.home.comcast.net/RangerPictureGallery/DPFE-Voltage-Test.html