1997 Ford Ranger Question

[Scoobum]

My daughter has a 1997 Ford Ranger with the 6 cylinder 4 litre engine. It's throwing two codes...one says it's the EGR and the other is the DPFE sensor. The engine surges and idles all over the place. Anyone know what the DPFE sensor is...and would either the EGR or DPFE cause this surging RPM issue?

[SuperSix]

Looks like the main function of the DPFE is to trigger an ECM code if there's an EGR issue.

http://www.accuratediesel.com/shop/122.html

"We have personally owned several Ford vehicles, including a Taurus, a Sable, and a Focus that the DPFE sensor failed on. Usually the failure starts with an almost imperceptible surge while cruising. Gradually it develops into an annoying surge and then the check engine light comes on eventually. Checking the code will usually reveal that you have a P0402. Other codes that may appear include P0401, P1400, and P1401. This problem was so bad for a few years that Ford actually put out a bulletin saying that if you had any of these codes and symptoms, don't even do any diagnosis, just replace the sensor!"

http://www.rockauto.com/catalog/raframecatalog.php?carcode=1138160&parttype=5088

[Scoobum]

Thanks so much Mark. I'll order one at the Ford dealer here in town tomorrow.