Here's what you *should* do:
1. Get the diagnostic trouble code (DTC): This is the key to understanding the problem. You can do this in a few ways:
* OBD-II Scanner: Buy a relatively inexpensive OBD-II scanner from an auto parts store or online. Plug it into the OBD-II port (usually under the dashboard) and it will read the DTC. This is the best and most reliable method.
* Auto Parts Store: Many auto parts stores will read the DTC for free. Just bring your car in.
2. Interpret the DTC: Once you have the code (it will be a series of numbers, e.g., P0171), you can look it up online (search "DTC P0171" for example) or in a repair manual to understand the likely cause.
3. Address the underlying problem: This is the crucial step. Simply clearing the code without fixing the problem will only cause the light to come back on. The problem could be anything from a loose gas cap to a more serious issue like a sensor malfunction or a leak.
4. Repair the problem: Once you've identified the issue, repair it. This might involve replacing a part, tightening a connection, or more extensive repairs. You can do this yourself if you're mechanically inclined, or take it to a mechanic.
5. Clear the code (after repair): After you've fixed the problem, you can clear the DTC using your OBD-II scanner. Many scanners have a "clear codes" function. After clearing the code, start the car and drive it for a while. If the underlying problem is solved, the SES light should stay off. If it returns, the problem wasn't fully addressed.
Important Considerations:
* Don't just ignore the light: Driving with a malfunctioning system can lead to further damage to your car, reduced fuel economy, and potentially unsafe driving conditions.
* Don't just clear the code without fixing the problem: This is a temporary fix at best and will likely result in the light reappearing.
* A gas cap: A loose or faulty gas cap is a common cause of the SES light. Try tightening your gas cap first, as this is the easiest and cheapest fix. Drive for a few days and see if the light goes out.
In short, turning off the SES light is a symptom of solving a bigger problem. Focus on diagnosing and fixing the underlying issue, and the light will go off naturally.
