There are two kinds of oxygen sensors used in practice: zirconia oxygen sensor and titania oxygen sensor. The common oxygen sensors are divided into single lead, double lead and three lead. The single lead is zirconia oxygen sensor; Double-lead titanium oxide oxygen sensor; The oxygen sensor with three leads is a heated zirconia oxygen sensor. In principle, the oxygen sensor with three leads cannot be replaced.

Once the oxygen sensor fails, the computer of the electronic fuel injection system will not be able to get the information of oxygen concentration in the exhaust pipe, so the air-fuel ratio can not be feedback controlled, which will increase the fuel consumption and exhaust pollution of the engine, and the engine will have unstable idle speed, misfire and surge. Therefore, troubleshooting or replacement must be done in time.

Common faults of oxygen sensor

Oxygen sensor poisoning

Oxygen sensor poisoning is a common and difficult fault to prevent, especially for cars that often use leaded gasoline. Even a new oxygen sensor can only work for thousands of kilometers. If there is only slight lead poisoning, and then a box of unleaded gasoline is used, the lead on the surface of the oxygen sensor can be eliminated and it can be restored to normal work. However, due to the high exhaust temperature, lead often invades its interior, which hinders the diffusion of oxygen ions and makes the oxygen sensor ineffective. At this time, it can only be replaced.

In addition, it is common for oxygen sensors to suffer from silicon poisoning. Generally speaking, the silicon dioxide generated by the combustion of silicon compounds contained in gasoline and lubricating oil, and the silicone gas emitted by improper use of silicone rubber sealing gasket will make the oxygen sensor ineffective, so it is necessary to use high-quality fuel and lubricating oil. When repairing, the rubber gasket should be selected and installed correctly, and the sensor should not be coated with solvents and anti-sticking agents other than those specified by the manufacturer.