Here's what you should do:
1. Diagnose the Problem: The most crucial step. You need to find out *why* the CEL is on. This can be done in a few ways:
* OBD-II Scanner: The best method. Buy a relatively inexpensive OBD-II code reader from an auto parts store or online. Plug it into the OBD-II port (usually under the dashboard) and it will read the diagnostic trouble codes (DTCs). These codes will give you a clue as to what's wrong. You can then search the codes online to understand the potential issues.
* Auto Parts Store: Many auto parts stores will read the codes for free. They can often give you some advice on potential solutions, though they may try to sell you parts.
2. Fix the Problem: Once you know the code(s), you can research the likely cause and either fix it yourself (if you're mechanically inclined) or take it to a mechanic. Fixing the underlying problem is essential.
3. Clear the Code (After Repair): *After* you've fixed the problem that triggered the CEL, you can clear the code. There are several ways to do this:
* OBD-II Scanner: Most scanners have a "clear codes" or "erase codes" function. 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 can sometimes clear the code, but it's not guaranteed, and it might reset other settings in your car's computer.
Important Note: Simply clearing the code without fixing the underlying issue will likely cause the CEL to reappear. Addressing the problem is the only way to ensure your car is running properly and safely. Ignoring the check engine light is strongly discouraged.
