I requested a diagnostic because my car was loud. I paid about $162 and was told it was the alternator belt and it was classified as low priority. The battery started draining so we took it back in a couple of weeks later and the entire altenator needed to be replaced (just under $800 with a coupon). A day or so later, the engines dies, but restarts. I scheduled an oil change and let them know the issue. They seemed to want to add another diagnostic on top of the alternator check (under warrenty) instead of just offering the alternator check- whatever the miscommunication was, it felt misleading. Just to rule out the altenator, I took it back in and of course they said it was fine. But I'm out over $1000 and my car is worse off. If you pay for a diagnostic, get a full report of what they did and didn't look at. My gut says they got a thousand bucks out of me without really caring about the condition of my car.