What to Do When the Buick Excelle's Emission System Malfunctions?

[StephenDella]

Clean the throttle body. If there is carbon deposit buildup, it's necessary to perform engine carbon cleaning. The system will stabilize once the temperature drops to a certain level and stops fluctuating.

[DiAndres]

A few days ago, my Buick Excelle also had the emission fault light come on, which scared me into pulling over immediately to check. First, try turning the engine off and restarting it—sometimes it's just a system glitch. If the light stays on, don't rush to drive; check if the fuel cap is tightened properly, as a leak can also trigger the fault. Then inspect the exhaust system for obvious damage, like a hole in the pipe. If you can't fix it yourself, head straight to a repair shop to read the fault code with a diagnostic tool—it could be a dirty oxygen sensor or a clogged catalytic converter. Last time, my car had an oxygen sensor issue, and cleaning it only cost 200 yuan. Emission faults should never be delayed—excessive exhaust harms the car and pollutes the environment. The repair shop technician said serious cases could cost tens of thousands to fix. Using 95-octane fuel and regularly driving at high speeds to rev the engine can help prevent this issue.