Now cars are becoming more and more people’s attention. Various industries such as car maintenance, car beauty, etc. have also developed. The automobile industry has sprung up like bamboo shoots after a rain, and more vehicles are paid attention to. A series of traffic accidents caused by vehicles are also endless, so we should not only care about the appearance and value of the car, but also the various parts of the car. We must know that many key parts of the car have a very important effect on the normal operation of the whole car. Important role, crankshaft position sensor is one of them. The crankshaft position sensor is usually installed in the distributor and is a very critical part of the centralized control system of the EFI engine. The crankshaft position sensor is a main control sensor of the car engine, it is used to reflect the engine speed and rotation angle to the engine computer. The engine computer can control the ignition and fuel injection of the engine based on this signal, that is to say, it is impossible for the engine to start without this signal. If the crankshaft position sensor fails, it will affect the normal driving of the vehicle.