Here's the proper procedure:
1. Diagnose the Problem: The first and most important step is to find out *why* the check engine light is on. You have a few options:
* OBD-II Scanner: This is the best approach. A relatively inexpensive OBD-II scanner (available at most auto parts stores) will read the diagnostic trouble codes (DTCs). These codes give you a specific indication of what the problem is. Look up the codes online to get a better understanding.
* Auto Parts Store Check: Many auto parts stores will read your codes for free. They might even offer advice on the likely cause and the necessary repairs.
* Mechanic: A qualified mechanic can diagnose and repair the issue. This is often the most reliable option, especially if you're uncomfortable working on your vehicle yourself.
2. Repair the Problem: Once you know the cause of the check engine light, fix it! This might involve replacing a sensor, repairing a leak, or other more complex repairs.
3. Clear the Code (After Repair): *Only after* successfully repairing the problem, you can clear the code. You can do this in several ways:
* OBD-II Scanner: Most OBD-II scanners have a function to clear diagnostic trouble codes.
* Disconnect the Battery: This is a less reliable method. Disconnect the negative (-) terminal of your battery for at least 30 minutes. This will often clear the code, but it won't fix the underlying problem. If the problem still exists, the light will come back on.
Important Considerations:
* The light might come back on: If the underlying problem isn't fixed, the check engine light will reappear. Simply clearing the code without addressing the issue is a temporary solution at best and can lead to serious engine problems.
* Safety: Never attempt any repairs that are beyond your skill level. Consult a professional mechanic if necessary.
In short, don't focus on resetting the light; focus on *fixing the cause* of the light. The light is a warning signal, not an annoyance.
