This is a Nitrogen Oxide (NOx) Sensor, also known as an SCR sensor, which measures the level of NOx in the exhaust gases for Volvo D13B engines. It is crucial for the proper functioning of the Selective Catalytic Reduction (SCR) system, ensuring emissions compliance, and is built to Volvo's exacting standards, unlike a faulty sensor that provides inaccurate readings. Observable symptoms of a failed NOx sensor include the check engine light illuminating, reduced engine power, and increased emissions.
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Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
The most common initial symptom of a failing NOx sensor is the illumination of the check engine or MIL light on the dashboard. If left unaddressed, the engine's performance may degrade, and the SCR system may not function correctly, leading to elevated exhaust emissions. Continued operation with a faulty NOx sensor can result in the vehicle being unable to operate at full power or even being taken out of service.
Ensure the exhaust system is cool before attempting removal and installation to avoid burns. Do not apply excessive force when threading the sensor into the exhaust pipe, as this can damage the threads.
After installing a new NOx sensor, it is crucial to perform a system reset or relearn procedure using diagnostic equipment to ensure proper calibration.