Here's what you should do:
1. Get the Diagnostic Trouble Code (DTC): You need to know *why* the light is on. This is done by using an OBD-II scanner. You can buy a relatively inexpensive scanner at most auto parts stores. The scanner will read the DTC, a code that tells you the specific problem.
2. Interpret the DTC: Once you have the DTC, you can look up its meaning online (many websites offer free DTC lookups). This will give you an idea of what might be wrong.
3. Fix the Problem: Based on the DTC, you'll need to repair the issue. This could be something simple (like a loose gas cap) or something more complex (like a faulty sensor or a serious mechanical problem). Depending on your mechanical skills, you might be able to fix it yourself, or you might need to take it to a mechanic.
4. Clear the Code (after repair): *Only after you've repaired the problem* should you clear the code. Many OBD-II scanners have a "clear codes" function. After clearing the codes, drive the car for a while (usually a few drive cycles) to see if the light comes back on. If it does, the problem wasn't fully resolved.
Warning: Simply disconnecting the battery or using a code reader to clear the codes without fixing the underlying problem is a temporary fix at best. The light will come back on, and the problem could worsen. Addressing the root cause is crucial for the safety and longevity of your vehicle.
