Researchers demonstrated how disable the airbags on a Audi TT (and others models) and other functions by exploiting a zero-day flaw in third-party software. Researchers said that in comparison to the remote hacking of Jeep car, this attack is less severe and less capable threat. To make the exploit work, mechanics computer must be compromised firstly or a malicious USB device to be plugged into the vehicle. The proof-of-concept implementation allows for Man-in-the-Middle attacks between the application and the car (in this case an Audi TT)”]
Source: http://securityaffairs.co/wordpress/41416/hacking/hack-airbag-audi-tt.html