CODE P0401
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Freshman User
Joined: Jul 2013
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CODE P0401
I have the 04 Ex 6l diesel and every so often I will get the P0401 Code. Does anyone have any ideas on what this might be, besides my EGR Valve? I am having a tough time finding anything wrong...Seems to run Great...
Fleet Mechanic
Joined: Nov 2013
Posts: 1,479
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From: New Brunswick, Canada
https://www.ford-trucks.com/forums/9...ml#post8317702
Here is a post about some possible culprits other than the EGR valve itself...
Here is a post about some possible culprits other than the EGR valve itself...
Elder User
Joined: Apr 2013
Posts: 941
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From: Bothell, WA
I have this same EGR code that comes up now and again. My "gut" feeling is that the cooler fins are clogged up a bit. I have no proof, that's just my "truck whispering" ways. Not sure if there is a way to check that, but it likely involves removing the cooler and at that point there is no point in putting that one back on.
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