This Inlet Nitrogen Oxides (NOx) Sensor is a critical component of the exhaust aftertreatment system in Volvo and Mack engines. It measures the amount of NOx in the exhaust stream before and after the SCR catalyst, allowing the engine control module (ECM) to precisely manage diesel exhaust fluid (DEF) injection for optimal emissions control. A faulty NOx sensor can lead to increased emissions, poor fuel economy, and potential engine derating or shutdown.
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Disconnect main battery before working on electrical components. Use dielectric grease on all connector pins. Check ground connections — most electrical faults trace to poor grounds. Test with multimeter before installing new parts.
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The first indication of a failing inlet NOx sensor is typically an illuminated check engine light or a specific emissions system warning. If the sensor continues to malfunction, the engine's emissions control system will operate inefficiently, leading to higher NOx output and potentially triggering engine derating to prevent further damage. The primary risk is non-compliance with emissions regulations and potential damage to the SCR catalyst due to improper DEF dosing.
Ensure the exhaust system is cool before attempting removal and installation. Carefully clean the threads of the exhaust port to ensure proper sealing and prevent damage to the sensor.
After replacing the NOx sensor, it is crucial to perform a diagnostic system regeneration and clear any related fault codes.