1999 Ford Taurus orb ll code PO401

1999 FORD TAURUS
98,452 MILES • 6 CYL • FWD • AUTOMATIC
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JCG1960
  • MEMBER
  • 1 POST
engine idles up and down after it warms up, put on new egr valve but still lighting up check engine light to code PO401
Sep 25, 2008 at 9:05 AM
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BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
Possible causes:
vacuum supply
EGR flow path restricted
VREF open to DFE
DFE EGR sensor no good
check DPF egr sensor hoses
Sep 25, 2008 at 10:17 AM
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