new-to-me '02 prius.

found a 're-conditioned '02 prius. Am new to hybrid vehicles- the vehicle came from an auction w/documentation... from a college where instructers teach. (I enjoy helping colleges) - drove car home- parked and started up again. The ... red triangle came up. Go to 'dealership'... and do not pass ...go. I parked the car, and started research. I find dealersips.. ingenuos.. and avoid same -usually. Also, am new to computer aided cars- and can't decipher how this one works. Must I go there and have a 'readout' costing ... (love this) - anywhere from 89.99... to 112.99- depending. That would give me their take on why red triangle is (now) on permanently. Is there another way for me to take a look- and decide if this car is worth keeping? It has been gone through... and did have a salvage title. I'm more interested in educating self . any links/info appreciated.