Verified answer

Certified=we will cover repairs during the warranty period

Pre owned=used

Used=pre owned

Different dealers have different "certification"(what they ll cover)

No legalities involved just a nice way of saying "I'll sell this car, with my name on it"

No difference at all. pre-owned is just another term for used car.

They are the same thing. Pre-owned is a fancy way of saying "used".

None. They mean the same thing. There may be laws in your state that cover "used" cars.

used.