PO401 code replaced all sensors and EGR valve.

Tiny
ANONYMOUS
  • MEMBER
  • 1998 FORD FIVE HUNDRED
  • 86,000 MILES
Po401 code replaced all sensors and egr valve? Check engine light come back on after 45 miles what else can it be?
Friday, February 1st, 2013 AT 7:54 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
P0401 †Exhaust Gas Recirculation Flow Insufficient Detected

Fault codes never say to replace parts. They only indicate the circuit or system that needs further diagnosis. Probably the most common cause of low flow is a passage plugged with carbon.
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Friday, February 1st, 2013 AT 9:22 PM

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