To find out the specific issue, you need to:
* Get the diagnostic trouble codes (DTCs): You can do this in a few ways:
* OBD-II Scanner: The most reliable method is using an OBD-II scanner (available at most auto parts stores). These scanners plug into a port usually located under the dashboard, and will read the stored DTCs. The codes are usually a combination of letters and numbers.
* Auto Parts Store: Many auto parts stores will read the codes for free. Just bring your car in.
* Mechanic: A mechanic will have the equipment to read the codes and diagnose the problem.
* Interpret the DTCs: Once you have the codes, you can look them up online (many websites provide DTC explanations) or in a repair manual specific to your Buick Century's year and engine. This will give you a better understanding of the potential problem. Common causes include:
* Oxygen sensor issues: A faulty oxygen sensor can cause the SES light to illuminate.
* Mass airflow sensor problems: A malfunctioning mass airflow sensor can disrupt the air-fuel mixture.
* Spark plug or ignition coil issues: These components are crucial for proper combustion.
* Loose gas cap: Surprisingly, a loose or damaged gas cap can trigger the light. Check this first!
* Catalytic converter problems: A failing catalytic converter is a more serious issue.
Ignoring the SES light is risky. Continuing to drive with a problem could lead to more significant damage to your engine, potentially resulting in costly repairs. It's best to address the issue as soon as possible.
