Auto shop business practices

Thanks for the replies. I'm asking because this is the 2nd time they have done this in the last year or so. I can't remember what the other problem was but they swapped out something very random that cost $500 and I remember thinking that there's no way it had anything to do with the problem at hand. Of course it didn't and they ended up fixing whatever the problem was, but they charged another grand on top of the pointless $500 charge.

I've had the whole 2 things go wrong on my car a few times as well. It's just funny that he's taken it to this shop twice and it's happened twice. The odds seem against you there but who knows? I guess it's time to find a new shop.