Here's the proper procedure:
1. Diagnose the Problem: This is the most crucial step. You need to find out *why* the SES light is on. You can do this in a few ways:
* OBD-II Scanner: The best approach is to use an OBD-II scanner (available at most auto parts stores). Plug it into the OBD-II port (usually under the dashboard), and it will read the diagnostic trouble codes (DTCs). These codes will tell you the specific problem the computer has detected. You can then search the code online to understand the issue.
* Auto Parts Store Check: Many auto parts stores offer free diagnostic code reading services. They can tell you the code(s) and might even give you an idea of the likely cause.
2. Repair the Problem: Once you know the code(s) and the likely cause, fix the problem. This might involve replacing a sensor, fixing a leak, or addressing a more significant mechanical issue.
3. Clear the Code (After Repair): *Only after you've successfully repaired the issue* should you attempt to clear the code. You can do this in a few ways:
* OBD-II Scanner: Most scanners have a function to clear the diagnostic trouble codes.
* Disconnect the Battery: This is a less reliable method. Disconnect the negative (-) battery terminal for about 10-15 minutes. This will often reset the computer, but it might not clear all codes, especially if the problem persists. Reconnect the battery and start the car.
Important Considerations:
* Don't just clear the code: Clearing the code without fixing the underlying problem will only cause the light to come back on.
* Persistent Problems: If the light comes back on immediately after clearing the code, the problem wasn't properly addressed. You need to re-diagnose and repair the issue.
* Safety: Some problems indicated by the SES light can affect drivability and safety. If you are unsure about diagnosing or repairing the problem, take your vehicle to a qualified mechanic.
In short: Focus on fixing the root cause, not just silencing the light. A properly functioning vehicle is far more important than a non-illuminated dash light.
