Internal nac fault after service

[Stewminator8846]

I have a 2011 2500 6.7 l that keeps throwing codes related to o2 sensor. Dealership just did it's thing and they think that there is a nac fault present and recommenfd replace and retest to the tune of 8200 hundred dollars. Not sure what a nac is? Help please.

 

[crash68]

Not sure what a nac is? Help please.

I'm going to take a guess the dealership is referring to the NOx adsorber-catalyst. This is most likely part of the DPF on your truck.

 

[Stewminator8846]

That is the code (NOx) that keeps recurring on a regular basis. My understanding is that it won't put the engine into limp mode, but it still concerns me. Truck runs fine, just have to keep clearing the code with my Banks module. Defintely can't afford the $ 8 grand on the assumption from the dealrship that replacing will fix. Thanks for commenting on this. Stewart