At least the local data can be accessed with OBD interfaces [1] most of the time. I don't know about stuff like theft prevention where the GPS location of the c

At least the local data can be accessed with OBD interfaces [1] most of the time. I don't know about stuff like theft prevention where the GPS location of the car is being constantly transmitted over GSM/UMTS/LTE, though. 1: https://en.wikipedia.org/wiki/On-board_diagnostics https://en.wikipedia.org/wiki/On-board_diagnostics