Quoted From greaser365:
9/17 … checks for “fuses, exhaust and vacuum leaks, along with a scope analysis to track o2 wave forms ( I assume this service would be available thru the same parts vendors who offer code checks for those of us without an oscilloscope or the ability to read one)….
Generally not. They will read out the codes, replace a battery, test alternators/starters but they don’t do diagnostics – nor would I want them to!