The location of the crankshaft position sensor can vary from one vehicle to another. Obviously it must be close to the crankshaft, so it is most often located on the front underside of the engine. It can usually be found mounted to the timing cover. Sometimes it may be mounted at the rear or the side of the engine.Click to see full answer. Considering this, what are the symptoms of a bad crankshaft position sensor? The Most Common Failure Crankshaft Position Sensor Symptoms Check Engine Light Is On. Check engine light comes on if the sensor is overheated. Vibrations in the Engine. Vibration from engine is usually the cause. Slow Response from the Accelerator. Erratic Starting. Misfiring of the Cylinder. Stalling and Backfiring. Also Know, how long does it take to replace a crankshaft position sensor? The labor to replace the sensor is just under 1.5 hours according to my labor guide and the part is approx $50. Without being able to test the sensor its hard for me to say its bad. The labor to replace the sensor is just under 1.5 hours according to my labor guide and the part is approx $50. Then, what happens if your crankshaft position sensor goes bad? If the crankshaft position sensor or its wiring have any issues, it can cause the crankshaft signal to be cut off while the engine is running, which can cause the engine to stall. This is usually a sign of a wiring problem. However, a bad crankshaft position sensor can also produce this symptom.What does a crankshaft positioning sensor do?A crank sensor is an electronic device used in an internal combustion engine, both petrol and diesel, to monitor the position or rotational speed of the crankshaft. This information is used by engine management systems to control the fuel injection or the ignition system timing and other engine parameters.