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Hello, thanks for posting
Exactly which part does the mechanic want to replace, I'll try to help with this but need a little more information, did the mechanic give you a reason for needing this part and what part is it? Did the mechanic check the 12 volt battery in the trunk?
It sounds like they are recommending the theft control computer, that's my best guess, without more specifics and no diagnostic code information that's the best I can do but since it's a dealer and not some independent shop that may not know much about the prius I gues you'll have to trust their decision.
You're welcome hanks for coming here.