How do i reset onboard computer for 97 Subaru Outback?

To reset the onboard computer of a 1997 Subaru Outback, disconnect the negative battery cable and let it sit for about 15 minutes. This will clear the memory and reset the onboard diagnostics. After reconnecting the cable, turn the ignition to the "On" position without starting the engine for a few seconds, then start the vehicle. Keep in mind that this may also reset other settings, so you may need to reprogram your radio and clock.