What to Do If the Vehicle Fails the Emission Test?

1 Answers
DelBenjamin
07/30/25 3:11am
Solutions for failing the emission test: 1. Clean the three-way catalytic converter, which is crucial for exhaust purification and prone to carbon deposit blockage, poisoning, or failure. Carbon deposit blockage is reversible and can be restored through cleaning, while poisoning, failure, or damage require replacement; 2. Clean the front oxygen sensor. Carbon deposits from incomplete engine combustion can adhere to the oxygen sensor's surface, leading to sensor failure over time; 3. Using higher-quality gasoline promotes complete combustion and helps improve exhaust emissions; 4. Poor engine condition affects exhaust emissions. If the vehicle fails the annual emission inspection, cleaning internal engine carbon deposits and fuel lines may help.
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