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The NOx sensor is part of the NOx reduction aftertreatment system used in diesel vehicles with urea based SCR systems. The sensor located upstream of the SCR catalyst directly measures the engine-out NOx gas concentration, which helps determine the optimum amount of urea injection.INLET NOx sensor replacement Freightliner DD-15 0101532228. Manufacturer Part Number 0101532228, A0101532228, DDE EA 0101532228 Compatible with Freightliner Cascadia 2012 - 2022, Engine: DD-13, DD-15 Compatible with Western Star 2016 - 2022 Engine: DD-13, DD-15 High European QualityOvernight shipping