The case of the missing catalytic converter
There are lots of moving parts involved in car parts that most of us have never heard of. This does not diminish the importance of said car parts, however. The catalytic converter is absolutely vital to a car’s performance and is often the object of theft because of the amount of precious and costly metals that inhabit the part.
Replacing one is also a costly repair. It must have been a total surprise to the owner, but the mechanic likely sees this more often than normal. Easy diagnosis, expensive repair. Is Elon Musk on to something with Tesla? Probably so.