Direct replacement for Cummins 2872947

The MCT CM2947 NOx sensor monitors nitrogen oxides in the exhaust stream and provides the data your engine control module (ECM) requires to manage the SCR aftertreatment system. Designed as an aftermarket replacement for Cummins OEM 2872947 (also referenced as 2872947NX and 2872947RX), it restores accurate NOx feedback on applications that specify these part numbers. By delivering stable, real-time measurement, the CM2947 supports proper DEF dosing and helps maintain emissions performance while reducing nuisance faults tied to aging or failed sensors.

Built for uptime and straightforward service

Engineered for heavy-duty environments, the CM2947 features a robust probe and sealed electronics to handle exhaust heat, vibration, and contamination. An OE-style connector enables plug-and-play installation to the existing harness with no splices and no special programming beyond standard OEM procedures. Use it during aftertreatment service to replace worn or intermittent sensors, improve diagnostic clarity, and minimize repeat visits for emissions-related issues. Cross-reference coverage includes Cummins 2872947/2872947NX/2872947RX and common aftermarket equivalents, simplifying identification across mixed fleets and inventory systems.

Service notes

Confirm the original part number on the removed sensor or by VIN/ESN to verify applicability. Inspect the harness connector for damage and route the lead away from hot or abrasive surfaces. After installation, clear stored codes and follow OEM-recommended drive cycles so the ECM can validate the new signal.