Is it possible to back out from a car contract if the dealer promises to fix the blemishes and then dosent and said its your resposibility in Indiana?

The only ways to back out of the contract are 1: If you have a written agreement with the dealer to fix the problems. 2: Verbal agreement with the dealer to fix the problem. then if one of these 2 exist, it would be a small claims court deal and the dealer is suppose to be the expert and the court will recognize that and hopefully side with you.