How do you reset the computer on a VW golf?

To reset the service lights on a Golf III, it's weird. You turn the key on (but do NOT start the engine), hold the odometer button, then turn the key off while still holding the button. Now press the hour button on the clock. This will reset the service reminder for an oil change. If you have an "IN 01", you must do it twice; three times for an "IN 02". If this is the only cause for your Check Engine light, it will go out after a few miles and stay out. To reset de computer to disconeect the battery of the car for 3 hours. Other way is with an scanner machine . The best way is to disconnect battery then hold battery terminals together for 3 seconds. This restores factory fuel and ignition map settings.