1991 Toyota Previa is there an adapter for the obd2 check engine light computer to attach to the computer of this vehicle
what is this adapter called if there is one
not that I know of. you read obd1 codes using a paper clip or jumper wire in the obd port. I think it is terminal te1 and e one, but I would consult a Haynes manual, or just google it. it is a simple procedure and involves counting check engine light flashes. there are youtube vids on it all over the place.