Generally speaking, cars traveling more than 100,000 kilometers need to replace the oxygen sensor once. Of course, we still have to decide according to the actual situation, the fault can be judged by observing the color of the tip of the oxygen sensor (the normal color is light gray). If it is a white tip, it means that the oxygen sensor has been contaminated with silicon to a certain extent and needs to be replaced in time. If it is brown, it is caused by lead pollution, and it must be replaced. However, if it is a black top, it is mainly caused by carbon deposits, and you only need to clean it.
It is important to know that when the oxygen sensor is aged to a certain extent, it must have a great impact on the air-fuel ratio of the car, leading to the problem of rising car fuel consumption. Then, replacing a new oxygen sensor at this time can naturally save fuel. However, if the rear oxygen sensor is replaced, it must be mentioned separately, because it is used to determine the working state of the three-way catalysis, so it will not bring fuel-saving effects after replacement.
