Join Date: May 2014
Location: N. Central Florida
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Watch the 12 V voltage as the car starts and runs.
A "generic" ODBII reader often won't see the Prius specific codes.
The car is now about 17 years old. If the hybrid battery is still the original.......I think it's a safe bet that it needs some attention (replacement).
It might be worth the cost to have a diagnostic done at a Toyota dealer.
'17 Prius C-4