po401 code

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Feb 26, 2006 | 09:41 AM

formermustang

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From: Naple Collier

po401 code

What is the first thing to check on a 2.5 L 4 popper

Feb 26, 2006 | 08:03 PM

Ken00

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From: South Jersey

You didn't say what year but I would suspect a DPFE sensor.

Feb 27, 2006 | 04:32 PM

formermustang

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From: Naple Collier

oops It's a 99. Is there any way to do a resistance or ohm check to see if it is bad

Feb 27, 2006 | 04:56 PM

Bob Ayers

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From: Durham, NC

Quote:

Originally Posted by formermustang

oops It's a 99. Is there any way to do a resistance or ohm check to see if it is bad

Check out this URL, Joe (Rockledge) did a great job documenting a test for the DPFE sensor:

http://rockledge.home.comcast.net/Ra...tage-Test.html

Feb 27, 2006 | 05:54 PM

formermustang

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From: Naple Collier

Thanx I'll get my butt out there in the morning and chek it. I was gettin worried cuz they have a tendincy to make that kind of stuff solid state which you can not test

Feb 27, 2006 | 05:56 PM

twinarrow99

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DPFE and possible EGR

Yes, agree with the above 100 percent. Had a P0401 code last month. I replaced the DPFE on my 99 2.5 Ranger after the voltage test showed it was bad. Also, as I had 82000 miles, replaced the EGR to be on the safe side. Also, when you replace the DPFE, blow some compressed air to clear out any crud in the two exhaust hose connections. Works like a champ!