Here's what you should do:
1. Diagnose the problem: The most crucial step is to find out *why* the check engine light is on. You can do this in a few ways:
* OBD-II Scanner: This is the best method. Buy a relatively inexpensive OBD-II scanner (available at most auto parts stores) and plug it into your car's OBD-II port (usually under the dashboard). The scanner will read the diagnostic trouble codes (DTCs), which give you a specific indication of the problem. You can then look up the code online to understand what it means.
* Auto Parts Store Check: Many auto parts stores offer free diagnostic code reading services. They can tell you the code(s) and may even offer advice.
2. Fix the problem: Once you know the DTC, you can fix the underlying issue. This might involve replacing a sensor, fixing a leak, or performing other repairs. Some issues are simple fixes, while others require professional help.
3. Clear the code (after repair): *Only after you've addressed the problem* should you attempt to clear the code. There are several ways to do this:
* OBD-II Scanner: Most scanners have a function to clear codes. This is the easiest and recommended method.
* Disconnecting the battery: This is a less reliable method. Disconnect the negative (-) battery terminal for about 10-15 minutes. This often clears the code, but it doesn't guarantee that the problem is resolved. The light may come back on if the issue persists.
Important Note: Simply clearing the code without fixing the problem will only temporarily turn off the light. The light will likely reappear, and the underlying issue could worsen, potentially causing damage to your car. Always diagnose and repair the problem before clearing the check engine light.
