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I just got my truck out of the shop with a bad HPOP they replaced it runs fine but i but the old code reader on it this morning and got 3 codes a p0278,p0405,p0603 what are these codes and how do I fix them are just don't wory about them. can't afford to give the dealer $2400.00 againe for awhile
The P0278 is contribution balance error #6 cylinder. could be an injector.
P0405 is an EGR gas recirculation sensor A circuit low. voltage below a specified range.
If the truck is running fine you may have some left over codes from before the repair. The tech may not have cleared the codes when he was done. I would clear the codes give it a few days and check again.
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