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2000 Expedition V8 Code P0401
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comnavguy
User
Jun 12, 2011, 12:56 PM
Post #1 of 5
(8409 views)
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2000 Expedition V8 Code P0401
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2000 Ford Expedition. 4.6L V8 with 137,000 miles shows P0401 EGR flow insufficient.
I have replaced the EGR valve, reset the codes, driven the vehicle over 40 miles and all I/M monitors are OK and Code P0401 came back.
What else could cause that code to set?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 12, 2011, 2:07 PM
Post #2 of 5
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Re: 2000 Expedition V8 Code P0401
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It's going to be a bad DPFE sensor or a plugged up passage in the throttle body. The DPFE is most likely but try applying vacuum directly to the valve at idle to see if it tries to stall. If it does, the passage is good.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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comnavguy
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Jun 13, 2011, 9:48 PM
Post #3 of 5
(8383 views)
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Re: 2000 Expedition V8 Code P0401
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Thanks again and again for your help!
This particular Ford engine doesn't like water anywhere near the number 8 cylinder. Spraying the engine off with a low pressure hose caused misfire on 8.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 14, 2011, 2:56 AM
Post #4 of 5
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Re: 2000 Expedition V8 Code P0401
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No engine likes water but what does that have to do with a PO401?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 9, 2011, 10:48 AM
Post #5 of 5
(8252 views)
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Re: 2000 Expedition V8 Code P0401
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More than likely the DPFE is the cause as HT stated. The aluminum ones would corrode inside from the moisture and acids in the exhaust. Also inspect the DPFE hoses. Make sure they aren't broken or plugged up with corrosion. If you have to replace the hoses, use hose specifically for the DPFE. Normal rubber hose will disintegrate with exhaust heat and gases. Don't get the REF and HI hoses switched and make sure you feel exhaust come out of the hoses when you rev the engine.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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