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Re: inferred back pressure strategy
Posted to HD/Fleet Forum on 2/19/2021 3 Replies

yeah Glenn you are right about that. In a nut shell, every time I would run the KOER self test with the factory 2003 ecm I would get a P0404 and P1408 both egr codes. I tried plugging in a 2005 ECM and running the KOER self test and it threw a p0299 and p2263 ... Login to read more.

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