What should I do if the automobile exhaust failed last year?

1. Remove the front and rear oxygen sensors and clean them in the bottle. It is not easy for many vehicles to disassemble the front and rear oxygen sensors. Some 4S shops directly hang bottles to clean the three-way catalytic converter without disassembling, which will lead to the engine oxygen transmission alarm.

2. Control the flow of cleaning agent. The best way to control the flow of cleaning agent is to shake the engine slightly at idle speed. If the engine vibrates seriously during cleaning, reduce the flow of cleaning agent immediately. Some 4S shop masters quickly inject large flow into the engine, which not only damages the engine, but also weakens the cleaning effect.

3. Before cleaning the three-way catalytic converter, clean the fuel injection nozzle, throttle valve and other oil system and air intake system. Some 4S shops only clean the three-way catalytic converter or clean the three-way catalytic converter first, and then clean the oil system and air intake system, which will cause the three-way catalytic converter to be polluted again.

4. When cleaning, the attachments on the three-way catalytic converter are oxidized and discharged as harmful gas, which should be connected to the tail gas recovery device and not inhaled. Some 4S shop plans are convenient and can be carried out directly indoors. At this time, the waste gas contains toxic gases such as sulfur dioxide.