Fix P0401
Hotshot
Joined: Jan 2004
Posts: 19,763
Likes: 1,081
From: St Louis
Originally Posted by 01ExpoXLT
Does anybody know how to fix an EGR(Exaust Gas Recirculation) Flow Insufficient for a 01 expedition. The Fault code is P0401
Steve
Mountain Pass
Joined: Jun 2003
Posts: 137
Likes: 11
First let me thank this forum for the tips on removing the TB and cleaning the EGR ports. I was amazed at how plugged my ports were. At 160K miles it was time. I had/have the same P0401 code. Question: I am sure the clogged ports on my TB was the culprit for my code, but will the check engine light go off immediately after the repair (assuming EGR and DPFE are good) or do I have to wait for the drive cycles to complete before the CEL will go off? I also thought about pulling battery cable.
Thanks again forum for the tips !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
Thanks again forum for the tips !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!
New User
Joined: Jun 2004
Posts: 6
Likes: 0
As part of the fix, I pulled the battery cable first before opening her up.
At that point, the light is reset when you start it back up unless you get the same or another code.
I think you would be ahead of the game to pull the cable for 20 minutes instead of waiting to see if it will go out.
Good luck.
At that point, the light is reset when you start it back up unless you get the same or another code.
I think you would be ahead of the game to pull the cable for 20 minutes instead of waiting to see if it will go out.
Good luck.
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