As the auto makers continue to place more electronics into cars the possibility of an compount failure raises expodentionally, as does the cost of finding the failure. Cars were!!!!!! designed for transpotation, now a computer with four wheels.  At a cost of $150 each time the dealer plugs your vechile into a reader the fee based design of repair is a matter of what it is not, not what is it. With hundreds of chips in a vechile today issolating the problem is very difficult if not imposible and of couse expensive. I still remember when I opened the hood of my car being able to see the ground on both sides of the motor, today you cannot  force a thin rode to the ground without damaging something. So now auto repair is like the other two groups, attorneys and doctors that "practice " what they do, which allows them the ability to bill you as much as there greed feels the need. Forget the new and fix the old, it is probably cheaper in the end, and more reliable.