Oxygen sensor: An oxygen sensor is an essential element on engines that use a three-way catalytic converter to reduce exhaust pollution. As the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification capacity of the three-way catalyst for CO, HC, and NOx will decrease sharply. Therefore, an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas. The ECU sends a feedback signal, and then the ECU controls the increase or decrease of the fuel injection amount of the injector, so as to control the air-fuel ratio of the mixture near the theoretical value.
An oxygen sensor installed in the front of the exhaust pipe is used to detect the exhaust of the car, detect the oxygen content in the exhaust, and then feed the result back to the ECU. The ECU then controls the amount of air and fuel injected into the cylinder next time based on the result. So that the fuel can be fully burned to avoid waste and produce pollutants. However, if the oxygen sensor is faulty or the operating conditions are too long, the ECU cannot obtain accurate results, and it is impossible to accurately control the amount of air entering and fuel injection, resulting in waste of fuel, that is, increased fuel consumption. The oxygen sensor is around 100,000 kilometers, and it will be checked and replaced.
