Cummins QSB 6.7L NOx Sensor 2018-2024: OEM 5461550

Reliable NOx Monitoring for Cummins QSB 6.7L Engines (2018–2024)

What is it?
The Cummins QSB 6.7L NOx Sensor (2018–2024), designated by OEM part number 5461550, is an exhaust emissions sensor designed for use on Cummins QSB 6.7-liter diesel engines manufactured between 2018 and 2024. Positioned in the exhaust or aftertreatment system, this sensor continuously measures nitrogen oxide (NOx) concentrations and sends that information to the engine control unit (ECU), which uses it to help guide emissions-related decisions.

Why choose this NOx Sensor?
This NOx sensor is built to match Cummins’ original equipment specifications for the QSB 6.7L platform, ensuring accurate readings and dependable integration with the engine’s emissions system and SCR (Selective Catalytic Reduction) controls. When a NOx sensor becomes worn, contaminated, or begins to fail, incorrect exhaust data can lead to improper Diesel Exhaust Fluid (DEF) metering, emissions system warnings, or uneven aftertreatment performance. Installing the correct OEM-specified sensor helps maintain consistent emissions feedback and supports coordinated SCR behavior.

Key Benefits
✅ Designed specifically for Cummins QSB 6.7L aftertreatment systems (2018–2024)
✅ Provides reliable NOx concentration data to the engine ECU
✅ Helps support correct DEF metering and SCR control logic
✅ Direct replacement — no modifications required
✅ Built for heavy-duty exhaust temperature environments

Applications
This NOx sensor is suitable for medium- and heavy-duty trucks and equipment powered by Cummins QSB 6.7L engines built between 2018 and 2024. It’s commonly used in commercial trucks, vocational machinery, agricultural equipment, industrial generators, and other platforms where precise exhaust emissions monitoring and reliable aftertreatment control are critical.

Installation Notes
Before servicing, allow the exhaust and aftertreatment system to cool completely. Locate the existing NOx sensor in the exhaust or aftertreatment assembly, then disconnect its electrical connector. Remove the old sensor and inspect the wiring harness and sensor mounting port for signs of soot buildup, corrosion, or damage. Install the replacement sensor and torque it to the manufacturer’s specifications. Reconnect the electrical harness, clear any stored fault codes, and verify correct NOx readings using diagnostic tools.

Final Thoughts
If your Cummins QSB 6.7L-equipped vehicle is showing NOx-related alerts, fluctuating emissions data, or irregular aftertreatment behavior, replacing a worn or faulty NOx sensor with the correct OEM-specified unit can help restore accurate emissions monitoring and smoother system operation. The Cummins QSB 6.7L NOx Sensor (OEM 5461550) plays an essential role in maintaining emissions system stability and dependable engine performance.