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International Automotive Technicians Network
Re: Cummins code 1663
Posted to HD/Fleet Forum on 10/3/2018

Have you scoped to see that the catalyst and or DPF is actually there and not hogged out or deleted? Check ECM software level to match original or for tampering. Also, what does your regen history look like? I'm guessing the fault will clear, can you datalog a... Login to read more.