Overview The MCT CM2946 is an aftermarket exhaust NOx sensor associated with OEM reference 2872946. It is listed within the Exhaust > NOx Sensors category and is intended as a replacement component in emissions aftertreatment systems. By measuring nitrogen oxides in the exhaust stream and communicating with the engine control unit, the sensor supports proper SCR dosing and steady emissions performance in heavy‑duty applications.

Application and fit Available catalog data positions CM2946 as a direct replacement for OEM 2872946, signaling form‑ and function‑compatible use wherever that original part number is specified. This listing confirms its role as a NOx sensor in exhaust aftertreatment; however, connector style, harness length, operating voltage, and environmental ratings were not published in the consulted sources and are therefore not specified here. For correct selection, match to the OEM part number and follow OEM service procedures for removal, installation, and post‑install checks.

Operational considerations Accurate NOx feedback helps the ECU manage the SCR system and can reduce emissions‑related fault frequency and derates when the rest of the aftertreatment system is operating properly. CM2946 provides a replacement path for fleets and service operations that maintain vehicles calling for OEM 2872946, simplifying procurement through clear cross‑references while supporting reliable emissions control in everyday duty cycles.