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I have a 2012 6.7 and have gotten that one a couple times, maybe 2-3 over 6 years. I clear the error and nothing happens. I researched it one time and the fix was replacing the forward Nox sensor. My brother-in-law is a Cummins ASE master mechanic and he's advised me to not worry about it unless is is a constant CEL.
When your truck goes into Regen and you're tooling around town, make sure you keep the revs up to ~2000.
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Joel and Diane
2005 Montana 2955RL, 400w Renogy Solar w/charge controller charging 4 6v 225AH for 12V at 450AH, 3000W GoPower Inverter
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