Agree. I was seriously frustrated recently while trying to get a friend's car to tell me why the brake warning light was on. Turns out a proprietary scan tool i

Agree. I was seriously frustrated recently while trying to get a friend's car to tell me why the brake warning light was on. Turns out a proprietary scan tool is necessary. A used one on Ebay cost $500. Modern computer-controlled cars are incomprehensible to many traditional mechanics, but I bet the average HN member wouldn't have too much trouble understanding the code that runs the computer-controlled mechanical systems of a car.