Troubleshooting methods for common faults of the h

2022-08-14
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Troubleshooting methods for common faults of oxygen sensor

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 it will not be able to feedback control the air-fuel ratio, which will make ③ Generally, excellent construction and decoration are adopted. The fuel consumption and exhaust pollution of medium carbon steel and alloy structural steel engines increase, and the engine has faults such as unstable idle speed, misfire and surge. Therefore, the fault must be eliminated or replaced in time. Once the oxygen sensor fails, the computer of the electronic fuel injection system will not be able to get the information of the oxygen concentration in the exhaust pipe, so the air-fuel ratio cannot be feedback controlled, which will increase the fuel consumption and exhaust pollution of the engine, and the engine will suffer from unstable idle speed, misfire, surge and other faults. Therefore, the fault must be eliminated or replaced in time

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

in addition, silicon poisoning of oxygen sensors is also common. Generally speaking, the silicon dioxide generated after the combustion of silicon compounds contained in gasoline and lubricating oil, and the silicone gas emitted by the improper use of silicone rubber sealing gasket will make the oxygen sensor invalid, so it is necessary to use high-quality fuel and lubricating oil. During repair, the rubber gasket should be selected and installed correctly, and the solvent and anti sticking agent other than those specified by the manufacturer should not be applied to the sensor

2. Carbon deposition: due to poor combustion of the engine, carbon deposition is formed on the surface of the oxygen sensor, or deposits such as oil or dust enter the oxygen sensor, which will prevent or block the external air from entering the oxygen sensor, making the output signal of the oxygen sensor inaccurate, and ECU cannot correct the air-fuel ratio in time. Carbon deposition is mainly reflected in the increase of fuel consumption and emission concentration. Second, when the carbon concentration of the carburized layer of high alloy carburized steel is too high, if the sediment is removed, it will resume normal work

3. Ceramic fragmentation of oxygen sensor: the ceramic of oxygen sensor is hard and brittle. Knocking with a hard object or blowing with strong air flow may break it and fail. Therefore, special care should be taken during handling, and problems should be replaced in time

4. Heater resistance wire burnout: for heated oxygen sensor, if the heater resistance wire is ablated, it is difficult to make the sensor reach the normal working temperature and lose its function. Replace the heater resistance wire

5. Internal circuit disconnection of oxygen sensor: connect the internal circuit

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