What to Do When a Vehicle's Exhaust Test Shows Excessive Carbon Monoxide Levels?

1 Answers
AniyahLynn
07/30/25 6:52am
If the CO level in the exhaust test exceeds the standard, you should check the air filter, spark plugs, intake air temperature sensor, and intake manifold pressure sensor. Additionally, consider adding dual-core anti-wear repair agents and high-efficiency cleaners. If these measures are ineffective, clean the three-way catalytic converter. Below is relevant information: 1. Excessive exhaust emissions mainly refer to carbon monoxide, nitrogen oxides, and nitrogen-hydrogen compounds exceeding the national exhaust emission standards. These excessive emissions are directly related to carbon buildup within the fuel supply system. More carbon buildup leads to more severe emissions, while less buildup results in milder issues. 2. Excessive carbon monoxide in a vehicle's exhaust is primarily due to poor combustion. The main causes of this phenomenon include: failed spark plugs, poor ignition, excessive cylinder wall clearance, uncalibrated valve timing, a failed three-way catalytic converter, and poor fuel injector atomization.
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