2000 Taurus Wagon
24V 200 HP Duratec 3.0L V6

EGR Emission Circuit
July - August 2002


Check engine light on.
OBD - II   DTC   =   P0401.
("Exhaust Gas Recirculation [EGR] Insufficient Flow".)
OK at ide. OK under throttle
Hesitation / jerking at neutral throttle ~ 1500 rpm
Car runs fine with the ERG vacuum line disconnected.

Ford uses a Differential Pressure Feedback EGR (DPFE) sensor on these vehicles to measure EGR flow. Ford tests to see if the EGR valve is stuck open by checking the DPFE sensor at idle. The DPFE sensor tests for a differential in pressure across a restriction. As flow increases, DPFE voltage rises. Typical DPFE readings at idle are around 0.6 volts DC.


The fix was a new DPFE sensor from Ford for $67.60.
The Service Mgr. admitted that they have changed a ton of them.

Garage Logic
Resident encounters
similiar problem.

From Les 2/20/03

" The main reason I wrote to you was, I am having a DTC with my 2000 Taurus. Your July 2002 post is almost exactly what I have. The car and motor are exact. I have 68,000 miles on it at the MIL light came on. Drives and runs fine. I have a Palm Pilot with Ease diagnostics software and it showed a P1401 code not a P0401. Everything else matches perfectly down to the dealer admitting that they have replaced alot of them. The only difference is that I am not getting any bucking at neutral throttle. Thanks for taking the time to post all of the great information. It sure would be neat to make a living at doing this stuff. "

From Les 2/24/03

" Replaced the differnetial pressure sensor like you suggested and everything is fine!!! Turned the mil light off with my Palm pilot and we are good to go. Drove it a couple of hundred miles and everything is quiet. I talked my local Ford dealer into a major discount, so the piece cost me $37 instead of almost $70..."

Internet users
encounter similiar problems.

From Cory 12/28/03

"In reference to your Jul - Aug 2002, 2000 Taurus, P0401 DTC Project, is there some special trick to removing the DPFE sensor? It is hard to get your hand on it. Do you need to remove something first, do I need a special tool, or do I just grab and yank?
Thanks for the great page; I wish I would have found it when I was actually looking for the sensor... finding that little bugger was half the battle. "

From Tom 12/29/03

"No special tool, just unplugs." Then asked him how he was doing with it.

From Cory 01/02/04

" Not so good. I have tried about every lever that I have to pry that thing off. I can get at it pretty well from the left side (facing towards the car from the front), but I can't seem to twist a screw driver far enough to pop the sensor out of the hose. Maybe I just need a bigger screw driver? Did yours come out fairly easily or did it require some force? I imagine that there is a coupling ridge on the sensor, but I'm guessing that there is nothing else binding the tube to the hose than just the friction of rubber on plastic. Is there? Did you remove the sensor from the rubber tubes or slip the rubber tubes from the metal pipes connected to the manifold?"

From Tom 01/02/04

"I'm going over to the garage tonight (for sure Sat.) I'll pull it in and check it out."

From DMiller 5/15/03

" I read one of your project pages concerning the Taurus DPFE sensor. Great information. Worked like a charm. I have a question for you though. I took my old sensor apart and found water in the "Ref" side (the smaller of the tubes). My rough engine returned after approx. a month. I took the DPFE off and found more water, dried it out and the roughness is gone again. My question is where could the moisture be coming from. I put some dry gas in the tank after changing the sensor but there is still some moisture somewhere apparently."
(We're still working on this one.)

From Marty R 5/19/03

" Fixed my for sensor using the info from your website. Saved $260. Thanks. "

From Pierre 5/30/03

" I have a 2001 Taurus with 36,600 miles and seem have the same symptoms. I have not had a chance to test the DPFE sensor but I may have a clue to DMiller's post on 5/15/03 about moisture or water in the sensor. This may be caused by water being forcefully splashed on the sensor. ..."     (continued)