First, thieves get into the car by decoding and hacking the door lock (more below) or by breaking the window in a way that doesn’t set off the ultrasonic alarm sensor. Then they attach a sophisticated reader to the on-board diagnostics connector. You may have a simple OBD reader yourself, such as CarMD, Innova, or Actron. Repair shops and dealers have multi-thousand-dollar readers. And thieves have single-purpose versions that purportedly can suck out the specific key code for your Bimmer, the one that’s about to become somebody else’s plaything.