Here's what you should do:
1. Diagnose the Problem: The first and most important step is to find out *why* the light is on. You have several options:
* OBD-II Scanner: Purchase a relatively inexpensive 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 give you a clue about the problem. You can then look up the codes online to get more information.
* Auto Parts Store: Many auto parts stores will read the codes for free. They can often give you an idea of the potential problem and what parts might need replacing.
* Mechanic: Take your car to a qualified mechanic for diagnosis. This is the most reliable method, especially if you're not comfortable working on cars yourself.
2. Repair the Problem: Once you know the cause of the malfunction, fix it! This might involve replacing a faulty sensor, fixing a leak, or performing other repairs.
3. Clear the Code (After Repair): *Only after you've successfully repaired the problem* should you clear the code. Many OBD-II scanners have a "clear codes" function. Some higher-end scanners even offer data logging and live data monitoring. After clearing the codes, drive the car for a while to ensure the problem is resolved. If the light comes back on, the problem wasn't fixed properly.
Important Note: Simply disconnecting the battery for a short period might clear the code temporarily, but it won't fix the underlying issue, and the light will likely return. This is generally not recommended.
Focus on fixing the root cause of the problem, not just silencing the warning light. Ignoring the MIL can lead to more serious damage to your vehicle.
