If there is nothing wrong with the oil level sensor, it is likely that there is something wrong with the fuel gauge circuit of the instrument panel. At this time, the instrument panel should be removed, and the circuit corresponding to the oil gauge on the instrument should be found out with a multimeter and pins for testing. If the fuel gauge of a new car suddenly drops to zero, and then it doesn't move, then there is something wrong with the sensor, so you can go directly to the 4S shop to replace it. Cause of water meter not moving: 1. The power cord of the water thermometer is short-circuited. The electric heating coil of the water thermometer is burnt out. 3. The electric heating coil of the water thermometer sensor is burnt out or has poor contact. 4. The sensor circuit of water thermometer is bad or short-circuited. The water temperature sensor consists of a temperature controller and a water level control part, and is heated by a decompression device in front of an electric valve and a rotary silencing heater. The function is to convert the temperature of cooling water into electrical signals and input them into ECU, including: 1. Correct fuel injection quantity; When the temperature is low, increase the fuel injection quantity. 2. Correct the ignition advance angle; At low temperature, the ignition advance angle increases; Delay at high temperature to prevent deflagration. 3. Affect the idle speed control valve; At low temperature, ECU controls the idle speed control valve according to the water temperature sensing signal, thus increasing the speed. 4. Affect the exhaust gas recirculation valve;