I purchased an 08 MKX on Saturday. The salesman showed me how the sync works and linked up my phone. I get the car home and the voice command doesn't work. You push the voice button and you get dead air. No beep, voice, nothing. It worked at the dealer!
I go to the dealer this AM to give them my PIN for the X plan deal we made on the car. I ask the salesman to show me how to work the SYNC and he say's that there must be something wrong. We take it into service and they say you have to leave it. I got a loaner for the repair.
The service guy asked if there is anything else wrong with the SYNC and I tell him that I haven't had it long enough to know.
I'll keep ya posted.