Multiquip 8983023940 DEF DCM Exhaust NOX Sensor - OEM Replacement Part

This DEF (Diesel Exhaust Fluid) DCM exhaust NOx sensor monitors nitrogen oxide emissions in the exhaust stream of Multiquip super silent generators, enabling proper SCR (Selective Catalytic Reduction) system operation and ensuring compliance with EPA emissions standards. The sensor provides real-time NOx concentration data to the engine control module, which adjusts DEF injection rates to optimize emissions reduction and maintain regulatory compliance.

Critical for Tier 4 Final emissions-compliant generator operation, this NOx sensor ensures accurate measurement of exhaust gas composition before and after the SCR catalyst. Sensor failure can trigger fault codes, derate engine performance, or prevent generator startup. Regular inspection during scheduled maintenance intervals is recommended, with replacement necessary when diagnostic codes indicate sensor drift, contamination, or electrical faults.

Compatible with the following Multiquip super silent generator models:

• DCA400SSI4F
• DCA400SSI4F3B
• DCA400SSI4F3PD

Genuine Multiquip OEM part, sold by an authorized dealer.