This is a Nitrogen Oxide (NOx) sensor, a critical component in the exhaust aftertreatment system of Volvo trucks. It measures the concentration of NOx in the exhaust gases to ensure emissions compliance, manufactured to meet stringent OEM standards. A failing NOx sensor can lead to increased emissions, check engine lights, and potential derating of the engine. Operators may observe a persistent Malfunction Indicator Lamp (MIL) or notice a decline in fuel efficiency.
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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.
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 is the illumination of the check engine light or a specific emissions system warning. If left unaddressed, the truck's performance may be reduced, and it could fail emissions testing, leading to operational restrictions.
Ensure the exhaust system is cool before attempting removal or installation of the NOx sensor. Apply anti-seize compound sparingly to the threads of the new sensor to prevent seizing in the exhaust pipe.
Inspect the SCR system components, including the DEF injector and catalyst, for any signs of clogging or damage when replacing the NOx sensor.