Most shops will charge a 1 hour diagnostic labor fee for a CEL so that's 1/2 of your estimate as a tech should diagnose a code, not just read a code and ASSUME that it's a bad part everytime.
With some of the newer cars, like early S80s for example, changing an O2 sensor isn't as easy as you'ld think. I'm not sure if I've replaced one on an S60 yet but 1 hour to replace one (just replacing that part) isn't an unusual flat rate time for that job. The code may or may not dissappear w/o Vadis re-setting it. If it does reset, it could take a few days.
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