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2000 Expedition V8 Code P0401


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comnavguy
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Jun 12, 2011, 3:56 PM

Post #1 of 5 (4630 views)
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2000 Expedition V8 Code P0401 Sign In

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?


Hammer Time
Ultimate Carjunky / Moderator
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Jun 12, 2011, 5:07 PM

Post #2 of 5 (4626 views)
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Re: 2000 Expedition V8 Code P0401 [In reply to] Sign In

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.



comnavguy
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Jun 14, 2011, 12:48 AM

Post #3 of 5 (4604 views)
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Re: 2000 Expedition V8 Code P0401 [In reply to] Sign In

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.


Hammer Time
Ultimate Carjunky / Moderator
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Jun 14, 2011, 5:56 AM

Post #4 of 5 (4599 views)
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Re: 2000 Expedition V8 Code P0401 [In reply to] Sign In

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.



Discretesignals
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Jul 9, 2011, 1:48 PM

Post #5 of 5 (4473 views)
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Re: 2000 Expedition V8 Code P0401 [In reply to] Sign In

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.





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