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It certainly is possible. Sometimes if something is just off a little bit, vibrations over time can shake things loose. I used to have an Evo that blew out a spark plug about 20-30k miles after I changed the plugs. Sounded crazy since that was under full boost.
Another time one the intake connection hoses blew off under full boost (again) probably about 1k miles after I did some work on something. Found out the the bottom part of the clamp was sitting halfway on the edge of the pipe. lol Loads of fun with that car.
That $100 sounds like it also includes the diagnostic time as well as the actual work to repair whatever the problem was. Typically you agree to an initial diagnostic time as a start (usually an hour). Probably .5s hr as diagnostic and .5hrs for the repair. Hourly rates vary per dealer so I can't say.
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