Many newer cars have computerised engine management systems that rely on sensors to report data to the computer. The crankshaft position sensor is used in conjunction with the camshaft position sensor to control ignition timing, let the computer know when to inject fuel and provide a spark sequence. Due to the mounting locations of this sensor, it is common for heat and oil leaks to cause this sensor to fail.
Scan the car for trouble codes. Remove and replace the crankshaft position sensor. Clear trouble codes. Check for the proper operation of the car.
The crankshaft position sensor will usually let you know when it needs replacing. The Check Engine warning light will illuminate, and you may notice that your vehicle has a hard time starting or running smoothly. When you notice any of these signs, schedule an inspection.