Crankshaft Position Sensor

The signal from the crankshaft position sensor is used by the ECU to determine crank rotation speed and to control ignition timing and fuel injection. A faulty sensor can cause misfires, excessive engine vibrations and backfires from improper fuel and timing parameters. If the sensor has completely failed, your vehicle may not start altogether. If your car exhibits any of these symptoms, check and replace your crankshaft position sensor.