Multiquip 8978288380 DEF DCM Exhaust NOx Sensor

The Multiquip 8978288380 is a genuine OEM DEF DCM Exhaust NOx Sensor designed for the DCA125SSIU4F ultra-silent diesel generator. As a direct OEM replacement, this sensor is built to the exact specification required by the emissions control system on the DCA125SSIU4F, ensuring accurate exhaust gas measurement and proper DEF dosing. Sourced directly through Multiquip's authorized parts program, the part is the correct service replacement when the original sensor fails or triggers a fault code.

Key Features

• OEM-Grade Emissions Accuracy — Manufactured to the exact output and signal tolerances required by the DEF dosing control module on Tier 4 diesel engines, ensuring the aftertreatment system reads exhaust NOx levels correctly.
• Direct Drop-In Replacement — Engineered to match the original sensor's connector, thread pitch, and harness routing on the DCA125SSIU4F, allowing straightforward installation without modification.
• Confirmed Fitment for DCA125SSIU4F — Specifically validated for the DCA125SSIU4F ultra-silent generator, eliminating guesswork when sourcing emissions components for this machine.
• Protects DEF System Function — A correctly functioning NOx sensor enables the DEF dosing system to regulate reductant injection accurately; a failed sensor can trigger derate modes or disable generator output entirely.
• Emissions Compliance Critical — On Tier 4 final engines, a faulty NOx sensor can cause the machine to fall out of emissions compliance and activate engine protection shutdowns — using the correct OEM sensor keeps the aftertreatment system operating within regulated parameters.

The DEF DCM Exhaust NOx Sensor monitors nitrogen oxide concentration in the exhaust stream of the diesel aftertreatment system. It sends a continuous signal to the Diesel Control Module, which uses that data to calculate and adjust the precise amount of diesel exhaust fluid injected into the exhaust to reduce NOx emissions to Tier 4 final standards. When this sensor degrades or fails, the control module loses accurate NOx feedback, which typically results in fault codes, engine derating, or a full shutdown to prevent emissions violations.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

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