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Exhaust P0401 Exhaust P0401
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Old 10-04-2008, 07:29 PM
Junior Member
  
Join Date: Oct 2007
Posts: 7
Exhaust P0401
Hey my old mans got a 1999 F-150 4.2L and throwing a 401 code which stands for Exhuast Gas Recirclulation Flow Insufficient Detected has any encounter this problem.
Anything helps
Thanks Kevin
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Old 10-04-2008, 08:11 PM
glc glc is offline
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Join Date: Dec 2006
Location: Joplin MO
Vehicle: 2003 Ford F150
Posts: 5,495
Common issue. The EGR valve could be bad, the EGR passages and/or lines could be plugged, the vacuum hoses to/from the DPFE could be collapsed and/or cracked, or the DPFE itself is bad.
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2003 F150XL 4.2 short cab/bed 4x2 5 speed manual 3.55 LS
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