Not sure if this has been posted, but here goes:
The essential theft process varies in detail, but all seem to have a fundamental methodology in common. First, the car is entered, either via nearby RF jammers that block the lock signal from the fob from reaching the car, or, more crudely, by breaking a window, as seen in the video in this post of the 1 Series being stolen. In cases of the window break, the thieves seem to be exploiting a gap in the car's internal ultrasonic sensor system to avoid tripping the alarm.
Once some sort of access to the vehicle is gained, the thieves connect a device to the car's OBD-II connector which gives them access to the car's unique key fob digital ID, allowing them to program a blank key fob to work with the car right then and there.
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