It's not as tragic as you think, and this is said by someone who grew up on an Audi 80 :) As for the sensor, I've recently put over 160 Euros into it, but I'm satisfied. Lately some plastic components small literally, it's my colleague on the 3D printer embrace and they work. I've heard that they are slowly making ones in metal and steel too, you just need to have a good schematic, so old books and manuals come in handy.