1997 Ford Explorer V8 Code PO401


Old 02-15-09, 07:23 PM
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Join Date: Jun 2007
Posts: 2
Question 1997 Ford Explorer V8 Code PO401

I think code PO401 has something to do with the EGR system failure. Where is the EGR valve and solenoid on the engine and how can I isolate the problem part?
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Old 02-16-09, 12:03 AM
Join Date: Dec 2001
Posts: 2,538
it may be difficult to isolate the problem part without a scanner, but most of the time it is either a bad dpfe sensor or clogged egr intake passages, the vac solenoid and egr valve rarely fail.
Old 02-16-09, 05:23 AM
Join Date: Apr 2006
Location: Floriduhhhhh Us of A
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Easiest way to determine if the problem is physical or electrical is to vacuum pump the EGR while at idle.
If the engine stalls or runs extremely ragged you then know the valve works and the passages are clear. Confirm vacuum from the solenoid to the valve and if that's in place move on to the DPFE...
If the engine DOESN"T run poorly with vac to the EGR at idle, you'll need to remove the valve check it for proper operation and then clear all passages of carbon
Old 02-16-09, 08:35 PM
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Join Date: Jun 2007
Posts: 2
Thx for the help

Thanks for the help. I will try it.

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