I haven't experienced a shop accepting a vehicle for 'diagnosis only'. Far as I know, the only standardized rates are for a repair - which includes the diagnosis. Since diagnosis is often the better part of time spent on a repair, you might expect a healthy charge if you elected NOT to have the parts replaced, at the shop's discretion. IMHO.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7