Engineered for Cummins Applications

The MCT CM26864 NOx sensor is a direct-fit replacement compatible with OEM 4326864 and related cross-references for Cummins diesel platforms, including QSB 6.7L (2013–2021). It continuously measures nitrogen oxide concentration in the exhaust stream and communicates with the engine control unit to support selective catalytic reduction (SCR) operation. A robust ceramic sensing element positioned in the hot exhaust flow delivers rapid, stable readings required for modern emissions strategies and regulatory compliance.

Accurate Feedback for SCR Efficiency

By providing precise, real-time NOx data over the vehicle’s data bus, the CM26864 enables the ECU to calibrate urea dosing accurately, helping the catalyst maintain conversion efficiency while avoiding unnecessary DEF consumption. This closed-loop control supports consistent combustion efficiency and helps minimize emissions-related fault frequency that can lead to derates. The sensor is designed for reliable operation in high-temperature, high-vibration exhaust environments to preserve measurement accuracy over service life.

Service and Compatibility Notes

Many aftertreatment systems employ two NOx sensors—one upstream ahead of the DPF and one downstream after the catalyst assembly. Replace the affected sensor during DOC/DPF service to maintain conversion monitoring and uptime. Cross-references include Cummins 4326864 and 2872943 and Dinex 22028. Built for OE-grade performance and covered by a 1-year warranty for heavy-duty on-highway use.