What to Do If Annual Inspection Fails Due to Emission Standards?

[Nunes]

Reasons and solutions for failing the annual emission inspection: 1. Poor fuel quality: If you frequently use low-quality fuel, it can lead to excessive carbon buildup after combustion. This may also affect the performance of the exhaust after-treatment system, reducing its lifespan, increasing pollutant emissions, and resulting in failed tailpipe emission tests. Therefore, before the annual inspection, it's best to refuel with high-quality gasoline and drive on the highway before testing. 2. Clogged catalytic converter: If you often drive at low speeds or use inferior fuel, the catalytic converter is prone to clogging or poisoning. In this case, you can purchase a professional cleaning agent to remove and clean the catalytic converter, or drive at high speeds for a while. High-speed driving is particularly effective in cleaning the engine's fuel system and cylinders. Additionally, at high engine speeds, fuel burns more completely, helping to flush out dirt and impurities from the fuel system and remove carbon deposits from the valves, thereby unclogging blocked passages and achieving a cleaning effect.