Fitment (Market-Validated Usage)

Based on OEM cross-reference listings, Cummins aftermarket catalogs, and verified marketplace applications, this NOx sensor is used in Cummins 6.7L diesel SCR (AdBlue) systems installed in RAM heavy-duty trucks.

Common system applications include:

• RAM 2500 6.7L Cummins Diesel
• RAM 3500 6.7L Cummins Diesel
• RAM 4500 / 5500 6.7L Cummins Diesel
• SCR (Selective Catalytic Reduction) diesel emission systems

Fitment is strictly based on OE number matching:
5491434 / SNS3007 / A3C00047900-01

OE cross-reference data confirms this sensor belongs to the Cummins 6.7L NOx sensor family used in SCR aftertreatment systems for RAM applications.

Marketplace listings also show this OE being used interchangeably across RAM 6.7L diesel platforms with multiple supplier references (Cummins / aftermarket SCR sensor assemblies).

Technical Description

This NOx sensor measures nitrogen oxide (NOx) concentration in diesel exhaust gases and sends real-time data to the ECM.

It is a critical component of the SCR (Selective Catalytic Reduction) system, which uses DEF (Diesel Exhaust Fluid) to reduce NOx emissions and meet EPA emissions requirements.

The sensor is designed for heavy-duty diesel exhaust environments with high thermal load and continuous monitoring capability.

Symptoms / Fault Codes

• Check engine light
• SCR / DEF system warning
• NOx sensor performance or communication faults
• P2200 / P229F type codes (system dependent)
• Engine derate / limp mode
• Increased emissions

OE / Part Numbers

• 5491434
• SNS3007
• A3C00047900-01
• Related Cummins family: 5491433 / 5491423 series (platform dependent variations)

FAQ

Is this sensor upstream or downstream?

This OE family is used in Cummins 6.7L SCR systems and may appear as NOx1 or NOx2 depending on installation position and model year calibration.

Are these sensors interchangeable?

Not recommended. Even if they look similar, Cummins NOx sensors are ECU-calibrated and may differ by harness length, connector type, or software calibration.

Why do multiple part numbers exist for the same sensor?

Because Cummins and aftermarket suppliers use multiple OEM/service numbers for the same SCR system component across different production batches and revisions.