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Discussion Starter · #1 ·
My 05 ( with 4" exh, chip, intake ) is throwing P0401 =EGR flow insufficient and P0404= EGR control circuit performance.

Do I need to worry about these codes? Will it effect my truck negatively? Can I run with them on?
 

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I have run my truck with the same codes for about a year with no problems. The cel turns off some time but at this point i think it looks funny with out it on.
 

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You can install a "Finger Stick" which is available from many vendors, and that wil prevent the light from coming on.
 

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If any one is interested, I have those codes in the 05 manual. PM me your email and I'll send you the scans.
 
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