2001 Ford F150 Wont pass smog

2001 FORD F-150
10,300 MILES • 6 CYL • 2WD • AUTOMATIC
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BRIANA003
  • MEMBER
  • 1 POST
I've had a trouble code P0401 coming up for months I took it to a well known auto repair chain, they changed the EGR, still have code, took it in 3 more times, told me they couldn't figure it out, but the last time they said I need to change the oxygen sensor. I still have the same code coming up.
Mar 25, 2009 at 6:01 PM
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BLACKOP555
  • ✓ASE Certified Mechanic
  • 10,386 POSTS
  • ASE Certified Mechanic
The DPFE sensor may be faulty and need replacement.

Also the egr valve and ports could be pluugged up with carbon and need cleaning.

the last things i theres not enough vaccum goign to the egr valve diaphragm to open it.
Mar 25, 2009 at 9:36 PM
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