How do you reset the computer on 2002 Hyundai Sonata?

To reset the computer on a 2002 Hyundai Sonata, disconnect the negative terminal of the battery and leave it unconnected for about 15 minutes. This allows the vehicle's computer to reset and clears any stored trouble codes. After the time has elapsed, reconnect the battery terminal and start the car. Keep in mind that this process may also reset other settings, such as the radio and clock.