Here's the proper approach:
1. Diagnose the Problem: The first step is to find out *why* the light is on. This requires using an OBD-II scanner. You can buy a relatively inexpensive scanner at most auto parts stores. These scanners will read the diagnostic trouble codes (DTCs) stored in your car's computer. The DTCs will provide clues about the specific issue.
2. Repair the Problem: Once you know the DTC(s), you can troubleshoot and repair the identified problem. This might involve replacing a sensor, fixing a leak, or addressing a more significant mechanical issue. You might be able to do some repairs yourself, but more complex issues will require a qualified mechanic.
3. Clear the Code (After Repair): *Only after* successfully repairing the problem, you can clear the SES light. Many OBD-II scanners have a function to clear the codes. Some auto parts stores will clear the codes for free if you bought a part from them. Otherwise, many advanced scanners allow you to erase the code yourself.
Important Note: Simply disconnecting the battery to try and reset the light will *not* solve the problem. The light will likely come back on until the underlying issue is fixed. This is a dangerous shortcut that could mask a serious problem.
In short, don't focus on resetting the light; focus on fixing what's causing the light to come on. Getting a proper diagnosis is crucial.
