As the cars are becoming more computerized, standard consumer and old school mechanics are facing difficulties to understand the cars without computers.  Sometime in the near future, you may be more worried about a hacker attacking on your car than on your PC. According to cnet group of researchers from two universities tested their hacking skills on two cars and found that they could remotely lock the brakes, the engine, and windows on a car; turn on the radio, heat, and windshield wipers; honk the horn; and change the speedometer display.

They were able to do all of that in tests on two cars of unnamed make and model by connecting a laptop to the electronic control system and controlling that computer wirelessly using a second laptop in a separate car.