Cummins QSB 4.5L NOx Sensor 2011-2018: OEM 4359551

Improve Exhaust Monitoring with a Cummins QSB 4.5L NOx Sensor

What is it?

The Cummins QSB 4.5L NOx Sensor, identified by OEM 4359551, is an exhaust emissions monitoring component intended for compatible Cummins QSB 4.5L diesel engine applications manufactured between 2011 and 2018. It measures nitrogen oxide (NOx) concentrations in the exhaust stream and sends important data to the engine or aftertreatment control system. Proper sensor operation helps maintain effective emissions monitoring and supports dependable Selective Catalytic Reduction (SCR) system function where equipped.

Why choose this NOx Sensor?

A properly functioning NOx Sensor is important for monitoring exhaust emissions and maintaining efficient diesel aftertreatment operation. Continuous exposure to high exhaust temperatures, soot contamination, moisture, vibration, or damaged electrical connections can gradually affect sensor reliability. Common signs of a faulty NOx sensor may include emissions warning lights, diagnostic trouble codes, inconsistent exhaust readings, increased DEF consumption, or engine derate conditions. Selecting the correct OEM-matched replacement helps maintain compatibility with the Cummins QSB 4.5L exhaust monitoring system.

Key Benefits

✅ Intended for compatible Cummins QSB 4.5L diesel engines (2011–2018)

✅ Measures nitrogen oxide concentrations in diesel exhaust gases

✅ Provides important emissions data to the engine and aftertreatment control system

✅ Helps maintain proper SCR system monitoring and DEF dosing control where applicable

✅ Offers an OEM-matched replacement for proper fitment

Applications

This NOx Sensor is intended for compatible Cummins QSB 4.5L diesel engine applications produced between 2011 and 2018. It is suitable for diesel-powered commercial and industrial equipment equipped with a matching exhaust emissions monitoring system. Verify OEM 4359551 against the original sensor, engine serial number, sensor location, and specific aftertreatment configuration before purchasing.

Installation Notes

Before installation, inspect the sensor mounting location, electrical connector, wiring harness, and surrounding exhaust components for corrosion, contamination, heat damage, or loose connections. Allow the exhaust system to cool completely before removing the existing sensor, and avoid touching or contaminating the sensing element. Follow the appropriate Cummins service procedures, apply the specified installation torque, and secure all electrical connections correctly. After installation, perform any required diagnostic procedures and verify proper sensor communication and exhaust readings.

Final Thoughts

Consistent exhaust monitoring plays an important role in maintaining dependable diesel engine and aftertreatment operation. The Cummins QSB 4.5L NOx Sensor (OEM 4359551) provides an OEM-matched replacement for compatible 2011–2018 applications, helping support reliable emissions feedback, effective SCR system monitoring, and proper exhaust aftertreatment function.