Direct Replacement for Cummins 4326870

The MCT CM6870 is a heavy-duty NOx sensor for the exhaust aftertreatment system, engineered as a direct replacement for Cummins OE 4326870. Typically installed at the inlet (upstream of the SCR catalyst) on ISX applications, it measures engine-out NOx and provides feedback to the ECM. Positioned in the exhaust/NOx sensors category, the CM6870 delivers OE-equivalent form and function for service replacement without modifications.

Emissions Control and Uptime Support

Accurate NOx feedback enables precise DEF dosing and helps maintain SCR efficiency, supporting emissions performance while minimizing unnecessary regenerations and fuel penalties. Stable inlet sensing allows the system to balance catalyst conversion with DEF consumption, helping fleets avoid nuisance fault codes and potential derates. While detailed electrical specifications are not published here, the CM6870 is designed for reliable operation in the thermal and vibration loads typical of heavy-duty exhaust environments.

Service-Friendly Replacement and Interchange Coverage

The CM6870 cross-references Cummins 4326870RX and 212-075-1007, along with Automann 577.90652, Dinex 904-6009, and Dorman 5EL012, streamlining procurement across distributors and fleets. Use the OE part number to confirm application prior to ordering, especially on ISX variants. Offered within Midwest Heavy Duty’s exhaust/NOx sensor lineup, the CM6870 provides a straightforward path to restore sensor function and clear emissions-related faults that can lead to downtime.