What should I do if the oxygen sensor frequently malfunctions?

[DeBradley]

If the oxygen sensor frequently malfunctions, you should check whether the spark plugs and ignition coil's operating voltage are normal, and inspect whether the three-way catalytic converter is functioning properly or if there is any blockage. If the oxygen sensor fails, the computer of the electronic fuel injection system will not receive information about the oxygen concentration in the exhaust pipe, thus unable to perform feedback control on the air-fuel ratio. This will lead to increased engine fuel consumption and exhaust pollution, as well as engine issues such as unstable idling, misfires, and surging. Oxygen sensor poisoning is a common malfunction, which can be divided into two types: lead poisoning and silicon poisoning. The former often occurs in cars using leaded gasoline, while the latter is caused by silicon dioxide generated from the combustion of silicon compounds present in gasoline and lubricating oil.