How to Deal with Vehicle Annual Inspection Failing Emission Standards?

[DeBrandon]

If a vehicle fails the annual inspection due to emission standards, it is recommended to replace or clean the spark plugs, oxygen sensor, catalytic converter, and carburetor. Below is expanded information on factors affecting excessive emissions: 1. Poor fuel quality: Low-quality gasoline may lead to excessive vehicle emissions. 2. Malfunctioning exhaust gas recirculation system: If the exhaust gas recirculation system is not functioning properly, faulty input signal sensors can cause an overly lean fuel mixture. 3. Inaccurate ignition timing: Misfires or insufficient ignition energy in the ignition system can result in incomplete combustion of the fuel mixture. 4. Low cylinder pressure: If the engine operates at excessively high temperatures, check whether the engine temperature displayed on the diagnostic tool is too high.