Cummins QSB 6.7L NOx Sensor 2018-2024: OEM 4326869
Real-Time NOx Tracking for Cummins QSB 6.7L Engines (2018–2024)
What is it?
The Cummins QSB 6.7L NOx Sensor, identified by OEM 4326869, is an emissions monitoring component used on engines produced between 2018 and 2024. This sensor is installed in the exhaust system and measures the concentration of nitrogen oxides (NOx) in the exhaust stream. It then sends this data to the engine control module (ECM), allowing the system to monitor emissions output in real time.
Why choose this NOx Sensor?
NOx sensors are essential for proper operation of the Selective Catalytic Reduction (SCR) system. The OEM 4326869 sensor is designed for Cummins QSB 6.7L platforms, helping ensure accurate communication with the ECM and emissions components.
The ECM uses NOx readings to determine how much Diesel Exhaust Fluid (DEF) to inject into the exhaust stream, which is necessary for reducing harmful emissions.
If the sensor provides incorrect data or fails, it can lead to warning lights, reduced engine power, increased fuel consumption, or improper DEF dosing. Maintaining a properly functioning sensor helps keep emissions levels controlled and system performance balanced.
Key Benefits
✅ OEM-matched NOx sensor for Cummins QSB 6.7L engines
✅ Measures nitrogen oxide levels within the exhaust system
✅ Sends real-time emissions data to the ECM
✅ Supports proper DEF dosing and SCR system function
✅ Direct-fit design for straightforward installation
Applications
This NOx sensor is used on Cummins QSB 6.7L diesel engines manufactured from 2018 through 2024. These engines are commonly found in commercial trucks, construction equipment, and industrial applications that rely on aftertreatment systems to meet emissions standards.
Installation Notes
Allow the exhaust system to cool completely before beginning service. Disconnect the electrical connector and carefully remove the existing sensor from the exhaust housing. Inspect the mounting area and wiring for soot buildup or damage. Install the replacement sensor using the correct torque specifications, reconnect the harness, and verify proper readings using diagnostic tools.
Final Thoughts
Monitoring NOx levels is essential for maintaining emissions compliance and system efficiency. The Cummins QSB 6.7L NOx Sensor (OEM 4326869) provides the data needed for the ECM to regulate DEF injection and support consistent aftertreatment performance across Cummins diesel platforms.