This sensor monitors the level of diesel exhaust fluid (DEF) in the vehicle's tank, ensuring the emissions control system operates correctly. It is manufactured to meet stringent Volvo quality standards, providing accurate readings unlike a faulty sensor that may drift or fail completely. Operators may notice a DEF system warning light or a reduction in engine power if the sensor is not functioning properly.
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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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An illuminated DEF system warning light on the dashboard is often the first sign of a malfunctioning level sensor. If ignored, the system may begin to restrict engine performance to enforce emissions compliance. Ultimately, an inoperative DEF level sensor can prevent the vehicle from starting after a shutdown period.
Before installing, ensure the DEF tank is completely empty and clean to prevent contamination of the new sensor. Avoid overtightening the sensor during installation, as this can damage the threads or the sensor housing.
Inspect the DEF tank for any signs of crystallization or contamination, and check the DEF pump and lines for proper operation when replacing the level sensor.