Why go into the used car market unequipped? The following tips can ease your concerns and help you walk away from the deal a real winner. Dealer v. Private Seller. If you purchase a car through a reputable dealer, they should offer to … To avoid buying a lemon, pay the fee to get a repair report on the car from a company like CARFAX. There isn’t a 100% guarantee that they have all of the information about the car , but you can reduce the chances of purchasing a lemon by …