EGR valve code


Asked by Aug 03, 2016 at 06:11 PM about the 2001 Ford Escort 4 Dr STD Sedan

Question type: Maintenance & Repair

My car decided to throw a P0401 code, I
have cleaned all ports to the EGR valve,
EGR valve itself, and even replaced the
DPFE sensor... I tested the voltage of the
old DPFE sensor and with the car off it
read 1.22 and with the car running it read
1.43... With the new one it read 1.22 with
the car off and with it on 1.60... Which still
isn't want it is supposed to be, I read it
was supposed to be between 3-4.5 with
the car running. I've run out of places to
look, any help would be great! Thanks

11 Answers


Have you checked the sensor voltage from the the ECM, you could have a rubbed through spot in the wiring and it is pulling the voltage low, also double check the sensor ground.


I have not checked, but I will! Thank you!


Definitely sounds like a bad ground


I tested the ground and it was reading 12, i read that I was supposed to read between 10-12, and we tested the bottom wire (not sure if that's the ECM) and it was reading 5 volts, what I also read.

0 -5.4L/how-to-test-the-egr-system-3 This is the website I have been using. Thanks for any information.


Ok so your reference voltage is good and it sounds like you have a good sensor ground. Have you cleaned the EGR feed tube and the pulse tube that feeds the DPFE? the way it looks to me is that the sensor is not getting any exhaust pulses so the voltage is staying low. You may also want to check the EGR valve itself for smooth operation, a hand held vacuum pump will help, if it is the least little bit sticky then replace it


Thank you! I will check those tubes tomorrow! And post my results. I did do the vacuum to the EGR, at first it wasn't doing too well but then I cleaned it with carb cleaner now it goes up and down smoothly. Thank you!


I have checked both tubes and they were clean and the tubes did not have any holes.(used a vacuum pump to test) I'm starting to think that Auto Zone sold me a defective DPFE sensor, I plan on going back today and get a new one.


Yep if the valve is closed and the tubes are in good shape and flow and you have good grounds and a good reference voltage it has to be a sensor.


Well thank you so much for your help!


I have had problems with some auotzone sensors myself, one time it took 3 tries before I got one to work right, it was a crank sensor.

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