Hey Joe, What the @#$% is a NOx Sensor?

"It's usually a good idea when changing out your DPF and/or DOC to swap out your NOx sensors as well, which can add significant cost, but will ensure smooth operation of an already complex system. This can be a bitter pill when you’re putting down several thousand for a new DPF or DOC, which begs the question, why are they so darned expensive?"
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