This is not a complete “how to steal the car”, but it does illustrate how, when tools are used for things they were not originally designed for, there can be unforeseen security issues as cyber criminals hunt for flaws, for example the internet for shopping and banking, and NFC and Bluetooth for unlocking cars.
Gone in 130 seconds: New Tesla hack gives thieves their own personal key | Ars Technica
However I am still using the keyless locking/unlocking on my car!
