I personally haven't returned a car I bought but I knew 2 people that have done that:
1) Decided not wanting the car anymore and told the dealer, she just dropped the key off and parked the car outside and walked away, told the financier that she walked away. The dealership freaked out, told the sales to sell the car quick, and come back to tell her that they sold it for a good price, that she didn't owe anything other than losing her down payment
2) Bought a car based on the assumption that the 0% deal is approved, then the dealer come out after all the paperwork that said it didn't get approved and he needs to pay 9% APR. He drove around for a few weeks trying to get the dealer to get it back or approve for the amount. Eventually he called the manufacture to clamp down on the dealer, and forced the dealer to take it back (he couldn't afford it on 9% but could afford it on 0%). Walked away with no loss, not even his down payment.
For a used car it would be tough because the manufacture will not be there to help, and if it is due to a bad repair it will be a repair problem rather than a car problem. That's why it is important to force them to fix everything before paying and taking the car. Good luck.
1) Decided not wanting the car anymore and told the dealer, she just dropped the key off and parked the car outside and walked away, told the financier that she walked away. The dealership freaked out, told the sales to sell the car quick, and come back to tell her that they sold it for a good price, that she didn't owe anything other than losing her down payment
2) Bought a car based on the assumption that the 0% deal is approved, then the dealer come out after all the paperwork that said it didn't get approved and he needs to pay 9% APR. He drove around for a few weeks trying to get the dealer to get it back or approve for the amount. Eventually he called the manufacture to clamp down on the dealer, and forced the dealer to take it back (he couldn't afford it on 9% but could afford it on 0%). Walked away with no loss, not even his down payment.
For a used car it would be tough because the manufacture will not be there to help, and if it is due to a bad repair it will be a repair problem rather than a car problem. That's why it is important to force them to fix everything before paying and taking the car. Good luck.