At the Autozone near me, they "rent" it out, you put full price on your credit card, they give you 90 days to bring it back. I kept one for 87 days took it back and they credited the money back, will do the same next time I get a cel.
Has a dedicaited plug on bottom left hand side of dashboard near the fuse panel,
just plug it in and turn key on. do not start. it talks to your car and shows the codes, write them down and look up on line or post and search here.