First try disconnecting your negative battery terminal, then reconnect after 20 min. so your PCM resets itself and then reinstall your custom tune..If you get the same error codes again ? try erasing the codes and see if they come back..If they do ? you'll then need to contact your tuning dealer, let him know about the codes and more than likely, he'll need to e-mail you a revised custom tune file for you to download into your X-CAL II