Paccar NOx Sensors
Paccar NOx sensors monitor nitrogen oxide levels in diesel exhaust systems and play a key role in SCR (Selective Catalytic Reduction) emissions control. These sensors send real-time exhaust data to the engine control module so the system can regulate Diesel Exhaust Fluid dosing and maintain emissions compliance. At Advanced Truck Parts, we supply Paccar NOx sensors designed for reliable operation in heavy-duty diesel trucks.
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Paccar NOx Sensors in SCR Aftertreatment Systems
Modern Paccar engines rely on NOx sensors to measure nitrogen oxide levels in the exhaust stream before and after the SCR catalyst. The engine control module analyzes this information and adjusts DEF injection to ensure the aftertreatment system reduces emissions effectively.
Most systems use two sensors:
- Upstream NOx sensor located before the SCR catalyst
- Downstream NOx sensor located after the SCR catalyst
Together, these sensors help monitor SCR catalyst efficiency and confirm that emissions levels remain within regulatory limits.
Common Paccar Engine Applications
Paccar NOx sensors are widely used on modern diesel engines operating in Kenworth and Peterbilt trucks.
- Paccar MX-11 diesel engines
- Paccar MX-13 diesel engines
- Kenworth T680, T880 and related platforms
- Peterbilt 579, 567 and vocational trucks
Sensor calibration and wiring connectors may vary depending on emissions generation, so matching the correct part number is important when replacing a NOx sensor.
Common NOx Sensor Failure Symptoms
- SCR or emissions system warning lights
- NOx sensor diagnostic fault codes
- Incorrect DEF dosing
- Engine derate or reduced power
- SCR efficiency or aftertreatment faults
NOx sensors can fail due to prolonged heat exposure, exhaust contamination, wiring damage, or internal electronic failure. Replacing a faulty sensor helps restore proper emissions monitoring and prevent aftertreatment system issues.
Verify Fitment Before You Buy
NOx sensors vary depending on engine model, emissions configuration, and truck model year. To confirm compatibility before ordering, provide:
- Engine serial number
- Truck year / make / model
- Current NOx sensor part number
- Photos of the sensor or connector if available
This information helps ensure the correct Paccar NOx sensor is selected for your truck.
Why Buy Paccar NOx Sensors from Advanced Truck Parts?
- Fitment verification before purchase
- Reliable emissions system components
- Fast shipping to minimize truck downtime
- Support for fleets, repair shops, and owner-operators
- Competitive pricing on diesel aftertreatment parts
