You can add keys through the NATS feature. The Maxisys give you a 5
digits PIN # that require a conversion to 4 digits. Enter your 5
digits pin code here http://keytechtools.com/bcmcodes/ and you will get the new 4 digits code .
For older cars the default pin is 5523.
ENGINE WILL NOT START NVIS/NATS SYSTEM DESCRIPTION KEY REGISTRATION.