How do you reset a polo classic 1988 model computer box?

To reset the computer box (ECU) of a 1988 Polo Classic, first disconnect the battery by removing the negative terminal for about 10-15 minutes. This will clear any stored error codes and reset the ECU. After reconnecting the battery, start the vehicle and allow it to idle for a few minutes to let the ECU recalibrate. If issues persist, consider checking for fault codes or other electrical problems.