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I'm getting codes p2bac and p1c54 what could be the main issu

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2011 dodge 5500 with a Cummings 6.7 coming up with Knox codes.

Vehicle: 2011 dodge 5500 Cummings 6.7

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P2BAC Nox Exceedence

P1C54 SCR Nox catalyst missing

what would be the common for this code a exhaust leak. right before the catalyst , that or the3 SCR catalyst is just gone.

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