Software from different suppliers brings up to some peculiar bugs, such as a heater turning itself on during a hot summer day. In December last year ABI Research estimated that roughly 30% of all warranty issues with new cars were microprocessor- and software-related.
Slashdot | If The Problem Persists, Reboot The Car

Why am I surprised? My wife’s car is mechanically-sound but the brake, check engine, and some other light have been stuck on for months because we refuse to pay the money to reset the car’s computer to make them go out.

Then, of course, there’s the story of the dude that got trapped in his Beemer when the computer failed. Nah, power steering’s about as advanced as I want it. Sadly, I don’t have that choice much anymore, unless I get a pickup or something. All passenger cars are pansied-out.