Genuine OEM Volkswagen Coolant Level Sensor, part number 2E0919372. This critical sensor is responsible for accurately monitoring the level of engine coolant within the reservoir, alerting the driver to low fluid conditions. It is typically installed in the coolant expansion tank. This compact electrical component weighs approximately 0.021 kg and measures 0.09m x 0.032m x 0.023m. A genuine OEM sensor provides precise calibration and signal characteristics, ensuring reliable coolant level detection and preventing costly engine damage from overheating.