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White1993Corvette
 Post subject: 1997 Ford Explorer 5.0L P0401 AND P0402
PostPosted: Mon Feb 02, 2009 4:07 am 
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How can it be BOTH 401 (Insufficient EGR Flow) and 402 (Excessive EGR Flow)?

What can cause this?
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 Post subject: 1997 Ford Explorer 5.0L P0401 AND P0402 
PostPosted: Today 
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Mohawkmtrs
 Post subject: Re: 1997 Ford Explorer 5.0L P0401 AND P0402
PostPosted: Mon Feb 02, 2009 9:11 am 
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Joined: Sat Sep 09, 2006 4:26 pm
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Location: Tyendinaga Mohawk Territory, Ontario
Replace the DPFE with a new one from the Dealer.

Aftermarket DPFEs don't last for very long.
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asecmt
 Post subject: Re: 1997 Ford Explorer 5.0L P0401 AND P0402
PostPosted: Mon Feb 02, 2009 5:37 pm 
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Location: Atlanta GA
Because the DPFE is bad, the voltage sometimes is high and other times it does not move. Replace it with a dealer part.
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