I have a Buick rendezvous 2004 that doesn't read the miles and it says AWD Disabled they say we'd have too change the computer. What would be an estimate on how much it'd be too get that fixed?

Strongly suggest FULL scan test from a quality independent auto repair shop that has the proper equipment & qualified personnel to do so.. Whomever "they" are should have provided you with ALL necessary information .. Computer malfunction possible .. least likely suspect !

I would agree and have a properly equipped shop fully diagnose the problem and provide you with an estimate on the correct repairs. We would always be happy to take a look at it for you, as would other shops in the area.