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What to Do If a Car Fails the Exhaust Emission Test?

1 Answers
MackenzieMarie
07/30/25 10:11am
Solutions for a car failing the exhaust emission test: 1. Replace the spark plugs; 2. Clean the contacts of the distributor and the distributor rotor; 3. Adjust the ignition timing; 4. Clean the air filter. The reasons for failing the exhaust emission test during the annual vehicle inspection are either vehicle-related issues or the use of incorrect fuel. Exhaust emission failures are mainly found in older vehicles. For example, prolonged use can lead to problems such as aging spark plugs and engine carbon buildup, which are common causes of failing the exhaust emission test. During the exhaust emission test, if the vehicle frequently experiences stop-and-go driving, it is necessary to inspect the vehicle's catalytic converter. If any issues are found, it should be replaced promptly; otherwise, it can also result in the vehicle failing the exhaust emission test.
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