What to Do If Your Vehicle Fails the Annual Exhaust Emission Test?

[JoelLynn]

If a vehicle fails the exhaust emission test during the annual inspection, it is advisable to replace or clean components such as spark plugs, oxygen sensors, catalytic converters, and carburetors. Below is additional information on factors that can affect excessive emissions: 1. Poor quality gasoline: Using low-quality gasoline may lead to excessive vehicle emissions. 2. Malfunctioning exhaust gas recirculation (EGR) system: If the EGR system is not working properly or the input signal sensor is faulty, it can result in an overly lean air-fuel mixture. 3. Inaccurate ignition timing: A misfiring ignition system or insufficient ignition energy can cause incomplete combustion of the air-fuel mixture. 4. Low cylinder pressure: If the engine operating temperature is too high, check the diagnostic tool to see if the engine temperature is excessively high.