Why is the oxygen sensor of the car broken?

Automobile oxygen sensor is broken, and the engine will have some faults such as unstable idle speed, fire and surge. Therefore, it is necessary to troubleshoot or replace it in time. Once the sensor fails, the computer of electronic fuel injection system will not get the information of oxygen concentration in the exhaust pipe, so it can't feedback control the air-fuel ratio, which will increase engine fuel consumption and exhaust pollution. The performance of the car with broken sensor is as follows: 1. Performance of the car when the speed sensor is broken: the speed sensing function is mainly to detect the speed of the electronically controlled car, and the control computer uses this input signal to control the engine idle speed, lock the torque converter of the automatic transmission, shift gears of the automatic transmission, switch on and off the engine cooling fan, cruise constant speed and other functions; 2. Symptoms of damaged speed sensor: the engine is unstable at idle speed; When the vehicle starts or slows down while driving, it stops or turns off in an instant; Engine acceleration performance decreases; There is a deviation in the speed display on the instrument; Engine fault light is on; 3. Bad performance of the throttle position sensor: If the throttle position sensor is out of tune, the correct ignition advance angle and air-fuel ratio of the mixture cannot be guaranteed. The throttle position sensor should be accurately adjusted to the specified voltage reading. If the adjustment is too low, the exhaust gas recirculation system will not provide enough exhaust gas in time, and it will knock when accelerating. If the adjustment is too high, the exhaust gas recirculation system will react too fast and provide too much exhaust gas, thus reducing the power. 4. Signs of damage to the coolant temperature sensor: If the coolant temperature sensor fails, the engine will have unstable idle speed, fire, flameout or increased fuel consumption. According to the manufacturer's regulations, the resistance value of the coolant sensor should be tested with a multimeter at different working temperatures.