How to tell if your NOx (Nitrogen oxide) sensor is bad?

The truck was diagnosed in this video is Freightliner Cascadia DD15 with one box. The nox sensor fault codes mentioned in this video are:
►SPN 3216 - FMI 14: NOx raw sensor does not support self diagnosis
► SPN 3057 - FMI 2: SCR outlet NOx sensor - Error
► SPN 520355 - FMI 14: NOx out sensor does not support self diagnosis

A nitrogen oxide sensor or NOx sensor is typically a high-temperature device built to detect nitrogen oxides in combustion environments such as an automobile, truck tailpipe or smokestack.

The term NOx represents several forms of nitrogen oxides such as NO (nitric oxide), NO2 (nitrogen dioxide) and N2O (nitrous oxide, also known as laughing gas). In a gasoline engine, NO is the most common form of NOx at around 93%, while NO2 is around 5% and the rest is N2O. There are other forms of NOx such as N2O4 (the dimer of NO2), which only exists at lower temperatures, and N2O5, for example.
More info: https://en.wikipedia.org/wiki/Nitroge...

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