EGR Fun

[LCGimp]

Well my check engine light came on the other day. I took it to autozone and its something in the egr system. My warrenty just ran out and i know that there is an extended warrenty on the pressure sensor so i would like to figure out if thats the problem or not before i take it to the dealer($120 bucks for a diagnostic seems silly to me). I have a Haynes manual and i checked the vacum regulator and it seems to be ok. The picture in the book is of the pre 99 v6 engines so i'm not 100% sure i am checking the right thing for the pressure sensor, but I get a signal voltage of 5v when i first turn on the car. The book says that it should start close to zero and work up to 5. It also reads 5 v for both the signal and referance voltages when the key is on but the engine isnt running. Does this likely point to the sensor, something else, or am i doing it wrong? Also does anyone have any other ideas or comments?
Thanks for any help, I appriciate it.

 

[Lsredy2kstang]

If you are getting an egr CEL, then it will be the egr valve that is bad.

It is easy to change but will cost in the neighborhood of 60 bucks.

I would start there.

 

[greenstang01]

Probably your DPFE sensor. About $16 at the Ford dealer, 5 minutes to install in your driveway.

Do you remember what code Autozone gave you?
Mine was P0401 "EGR Flow Insufficient"

 

[LCGimp]

ya i believe that was the code, and thats the part i am figuring is having the problem. That part is under an extended warrenty from ford, i think i'll just take it in and take my chances. Thanks for the help.