What are the reasons for inaccurate car fuel gauge readings?
1 Answers
Reasons for inaccurate car fuel gauge readings: 1. Fuel gauge malfunction: A faulty fuel gauge can cause the gauge to remain stationary or display inaccurately. The diagnostic method is to observe if the fuel gauge needle doesn't move within about half a minute after turning on the ignition switch; 2. Instrument coil short circuit: A short circuit in the instrument coil can also lead to inaccurate fuel gauge readings. A simple diagnostic method is to measure the voltage using a multimeter; 3. Sensor failure: A faulty sensor can cause the fuel gauge to remain stationary or display inaccurately. The diagnostic method involves clamping the multimeter probes to the two terminals of the fuel sensor's variable resistor and measuring the resistance value using the Rx1Ω range. If the result doesn't match the standard value, it indicates a sensor malfunction.