What are the reasons for high carbon monoxide in the engine?

[StMatthew]

The reasons for high carbon monoxide in the engine are as follows: Sensor failure: The sensor that controls and stabilizes the air-fuel ratio fails, causing excessive gasoline injection. As a result, there is insufficient air for the car, leading to incomplete combustion and insufficient gasoline combustion, which increases the carbon monoxide in the exhaust. Clogged or dirty three-way catalytic converter: This can cause the three-way catalytic converter to lose its ability to convert carbon monoxide, requiring cleaning or replacement of the three-way catalytic converter. Excessive carbon deposits: Simply cleaning the carbon deposits to allow the fuel to burn completely and prevent the engine from accumulating carbon deposits will significantly reduce the carbon monoxide in the car's exhaust.