What you likely want to do depends on *why* you want to reset the computer. Here are some possibilities and how to address them:
* To clear trouble codes (check engine light): This is the most common reason for wanting to "reset the computer." You can't do this by simply unplugging the battery. You'll need to:
* Use an OBD-II scanner: This is the best method. An OBD-II scanner can read and clear trouble codes. You can buy a relatively inexpensive scanner at most auto parts stores.
* Disconnect the battery's negative terminal: This *might* clear some codes, but it's not guaranteed and it's less reliable than using a scanner. Disconnect the negative (-) cable, wait at least 30 minutes (some recommend longer), then reconnect it. The car's computer will relearn its parameters as you drive.
* To reset learned parameters (e.g., for fuel economy, shift points): Again, disconnecting the negative battery terminal for 30 minutes or more will do this. The computer will relearn as you drive. Note that this is done often after a battery replacement, or if a major sensor has been replaced.
* To reset the radio: This is entirely separate from the car's computer system. Consult your owner's manual for the radio's reset procedure. It often involves holding down certain buttons.
Important Note: If you're having persistent problems, simply resetting the computer is unlikely to fix the underlying issue. Diagnosing the problem properly using an OBD-II scanner is the best way to deal with check engine lights or other persistent malfunctions.
