* Check Engine Light (CEL): You can't just reset the CEL; it indicates a problem. You need to *diagnose* the problem (using an OBD-II scanner is best) and fix it. The light will then usually turn off automatically after a certain number of successful drive cycles. Simply disconnecting the battery will *temporarily* clear the code, but the light will likely return if the underlying issue persists.
* Battery Terminals (after battery disconnect): If you disconnected the battery for any reason (e.g., replacing the battery), you may need to reset some electronic settings. This usually involves re-pairing devices like your radio. You might need the radio code if you have it.
* Other electronic systems: Are you having issues with the radio, power windows, seats, or other electronic components? Each will have a different potential solution.
If you mean the Check Engine Light:
1. Use an OBD-II scanner: This is the best approach. An OBD-II scanner will read the diagnostic trouble codes (DTCs) stored by the car's computer. These codes will pinpoint the problem(s). You can buy inexpensive OBD-II scanners at auto parts stores.
2. Fix the problem: Once you know the code(s), you can research the issue online or consult a repair manual. Fixing the underlying problem is crucial.
3. Clear the code (after repair): After the repair, many OBD-II scanners have a function to clear the codes. Your car's computer will typically clear the code automatically after a few successful drive cycles if the issue is truly resolved.
If you mean something else, please be more specific about what you're trying to reset. For example, tell me what's not working or what you've tried already.
