Sensor is a modern automotive electronic control system, an important part of it bears the engine fuel injection, electronic ignition, idle speed control, air control, exhaust gas recirculation, steam recovery and chassis part of the drive, driving, steering, brake, Electronic suspension and body parts of the anti-theft, central door locks, automatic air-conditioning and other automotive electronic control systems in major information collection and transmission, electronic control systems are very important components. Without its normal work, cars would not normally travel. Therefore, in order to master the modern automobile maintenance technology, it is necessary to master the role of automotive sensors, structure, principle, detection methods and its connection with the electrical control system. . Keywords: sensor detection method