I have the same issue with my 2016 fusion SE company car. There is an icon on the radio screen that says "line in" but there is no aux in/3.5mm input anywhere. I also have a lifetime satellite radio subscription on a portable pioneer radio that I have used in 5-6 other cars that did have a aux in port. I'm going to try the bluetooth transmitter. I was thinking of using a 3.5mm to USB cord, but I doubt the ford sync would recognize it.