This sensor measures the level of diesel exhaust fluid (DEF) in the vehicle's tank, crucial for the proper functioning of the selective catalytic reduction (SCR) system and emissions compliance. Manufactured to meet stringent OEM quality standards, it provides accurate and reliable level readings, unlike a worn or contaminated sensor. Operators may notice a DEF system warning light, an incorrect DEF level display, or reduced engine power if this sensor malfunctions.
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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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A primary symptom of a failing DEF level sensor is an inaccurate or fluctuating display of the DEF fluid level. If the problem is not addressed, the vehicle's emissions control system may activate warning lights, and engine performance could be restricted. Continued operation with a faulty sensor may eventually prevent the vehicle from restarting after being shut down, due to emissions non-compliance.
Ensure the DEF tank is thoroughly cleaned before installing the new sensor to prevent immediate contamination. Carefully align the sensor with the tank's mounting port to avoid cross-threading.
Inspect the DEF pump, lines, and injector for any signs of blockage or leaks, and check the DEF fluid quality when replacing the level sensor.