Here's what you should do:
1. Get the Diagnostic Trouble Code (DTC): The SES light indicates a problem. You need to find out *what* problem. You can do this in a few ways:
* OBD-II Scanner: This is the best option. Buy a relatively inexpensive OBD-II code reader from an auto parts store or online. Plug it into the OBD-II port (usually under the dashboard) and it will read the trouble codes. These codes will tell you what the problem is (e.g., O2 sensor failure, mass airflow sensor issue, etc.).
* Auto Parts Store: Many auto parts stores will read the codes for free. Just bring your car in.
2. Address the Problem: Once you know the code(s), you need to fix the underlying issue. This might involve replacing a sensor, fixing a leak, or performing other repairs. Don't just clear the code without fixing the problem; it will likely come back on.
3. Clear the Code (After Repair): *Only* after you've fixed the problem, you can clear the code. Again, there are several ways:
* OBD-II Scanner: Most scanners have a function to clear codes. Follow the instructions for your specific scanner.
* Disconnect the Battery: This is a more crude method. Disconnect the negative (-) battery terminal for about 10-15 minutes. This will often reset the computer, but it's not as reliable as using a scanner. Note: This will reset other things like your radio presets.
Important Considerations:
* Ignoring the SES Light is risky: Driving with a malfunctioning component can cause further damage to your engine and potentially lead to expensive repairs.
* Professional Diagnosis: If you're not comfortable diagnosing and repairing car problems yourself, take your car to a qualified mechanic.
In short, resetting the light is the last step, not the first. Focus on *why* the light is on and fix the root cause.
