First, you MUST diagnose and fix the problem that triggered the SES light. This usually requires a diagnostic trouble code (DTC) scan using an OBD-II scanner. Auto parts stores often offer free code reading services. The code will tell you what the problem is.
After fixing the problem:
There are several ways to reset the SES light, ranging from simple to more involved:
* Disconnect the battery: This is the simplest method. Disconnect the negative (-) battery terminal for at least 30 minutes (some recommend longer). Reconnect the terminal and start the car. This often resets the light, but it doesn't guarantee it will stay off unless the problem was truly solved.
* OBD-II Scanner: Most OBD-II scanners (the ones that read and clear codes) have a function to clear the codes. This is the most reliable method after fixing the problem, as it directly clears the stored code from the car's computer.
* Driving cycles: Some vehicles will automatically reset the light after a certain number of successful drive cycles (engine running at operating temperature for a specified amount of time). This is less reliable and can take time.
Important Considerations:
* The "Check Engine" light and "Service Engine Soon" light are the same. They refer to the same diagnostic system.
* Ignoring the light can lead to further damage. Address the underlying problem as soon as possible.
* If the light returns after resetting, the problem wasn't fixed. You need to re-diagnose and address the issue.
In summary, don't just reset the light; fix the problem first! Then, use an OBD-II scanner to clear the code for the best results. Disconnecting the battery is a last resort and might not be effective in all cases.
