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Good advice for the truck and life! Reset and Forget
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This. I just had my upper intake off and replaced all my vac lines and any other worn/cracked components under the intake manifold. The EGR VSV (blue/green one) was toast. New one got rid of the CEL that has been present for 2 years. I've driven about 1000 miles since the repair with no CEL and no further issues. Hope you get 'er fixed.As someone who went through this (and thinks he is done), one of the most common culprits is the EGR VSV - if your mechanic didn't replace that, I'd start by testing it. Lot of info available on it including here Checking VSV for EGR easy way P0401 - https://forum.ih8mud.com/threads/checking-vsv-for-egr-easy-way-p0401.211364/
Thank you for sharing your experience and the good advice. I will let everyone know what the solution was once resolved. Best Regards, JoeThis. I just had my upper intake off and replaced all my vac lines and any other worn/cracked components under the intake manifold. The EGR VSV (blue/green one) was toast. New one got rid of the CEL that has been present for 2 years. I've driven about 1000 miles since the repair with no CEL and no further issues. Hope you get 'er fixed.
Edit: make sure you test the vsv's per the service manual. Those tests will either save you a few hundred dollars in parts or give you peace of mind about which parts need replacement.
Woodsman , thank you ! it's in the dealership with an old school 80's mechanic who is doing just that , will keep you posted . best regards, JoeGotta take off the upper manifold, clean it and replace VSV and all vacuum lines and parts associated with it that are on the underbelly of manifold...this solved my PO401
That's three words...well, two and an acronym2 words to clear it. EGR test kit
2 words to clear it. EGR test kit
I edited it lolThat's three words...well, two and an acronym