Here's what you should do:
1. Get the diagnostic trouble code (DTC): You'll need to use an OBD-II scanner to retrieve the code(s) stored in the car's computer. Auto parts stores often offer free code reading services. The code will tell you *what* problem the car's computer detected.
2. Address the problem: Once you know the code, you can diagnose and fix the issue. This could range from something simple (like a loose gas cap) to something more complex (like a faulty sensor or failing component). Research the specific code online or consult a repair manual.
3. After repair, clear the code (if needed): *After* you've fixed the problem that triggered the SES light, you can clear the code using your OBD-II scanner. Many scanners have a "clear codes" or similar function.
Do NOT attempt to simply reset the light without knowing the cause. The light is there to warn you of a potential problem; ignoring it could cause more serious and expensive damage down the road. Fixing the underlying problem is crucial, not just silencing the warning light.
