Volvo NOx Sensors

Volvo NOx sensors monitor nitrogen oxide levels in diesel exhaust systems and play an essential 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 Volvo NOx sensors designed for reliable performance in heavy-duty diesel trucks.

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Volvo NOx Sensors in SCR Aftertreatment Systems

Modern Volvo diesel 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 Volvo SCR systems use two sensors:

Upstream NOx sensor located before the SCR catalyst
Downstream NOx sensor located after the SCR catalyst

These sensors work together with the DEF pump, dosing module, and SCR catalyst to maintain emissions compliance and optimal engine performance.

Common Volvo Engine Applications

Volvo NOx sensors are widely used across several heavy-duty diesel engine platforms.

Volvo D11 diesel engines
Volvo D13 diesel engines
Volvo D16 heavy-duty engines
Volvo VNL and VNR truck platforms

Because emissions configurations and wiring connectors can vary by model year, confirming the correct sensor 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 may fail due to prolonged heat exposure, contamination from exhaust deposits, damaged wiring, or internal electronic failure. Replacing a faulty sensor helps restore accurate emissions monitoring and prevent aftertreatment system issues.