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Code P0401

Tiny
MIKE421$$
  • MEMBER
  • 2004 FORD EXPLORER
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 98,000 MILES
Hi, I have the vehicle listed above and I have a code “p0401” EGR valve insufficient flow, I cleaned the throttle and the idle is moving fine but I still have that code. What should I first do to fix it?
Monday, December 3rd, 2018 AT 3:13 PM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

The most common cause for this code is the DPFE sensor. Very common failure.

It is mounted on top of the EGR which is under the plastic cover. It is simple to replace and the parts stores should stock them.

Roy
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Monday, December 3rd, 2018 AT 4:18 PM
Tiny
MIKE421$$
  • MEMBER
  • 2 POSTS
What would be my next step after fixing this and I still get the code?
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Monday, December 3rd, 2018 AT 4:33 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
One step at a time.

In 99% of all the Fords I have done, that took care of it. The other 1% was the hoses were melted but you do not have that issue.

In rare cases, a clogged catalytic converter will cause this but you would have other issues.

Roy
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Monday, December 3rd, 2018 AT 4:41 PM
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
Agreed! If the DPFE sensor has not been replaced, I would do it for sure.
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Wednesday, December 5th, 2018 AT 5:38 PM

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