Generally speaking, the buyer has no right to cancel a new car deal. In a door-to-door sale, the buyer has what is known as a three day right to back out of a deal, or to rescind a contract. In the case of a mortgage loan, the purchaser also has the right to change his mind within three days. Unfortunately, this is not the case in the new car sales arena. Before the buyer enters into any written contract for the purchase of a new vehicle, he must be certain that he is getting exactly what he wants, at the price he wants. The only exceptions to the foregoing are situations where fraud is involved, or where a state "Lemon Law" may come into play and the buyer may be able to get his money back, or get a different vehicle to replace the first one he bought.
How to Cancel a New Car Deal
Ask the new car dealer if he will allow you to back out of your contract. He does not have to let you do this, but it does not hurt to ask, especially since there may be no other way out.
Consider whether or not a fraud may have been perpetrated against you. If the new car dealer has misrepresented or failed to disclose an important fact concerning the car you have contracted to purchase, you may be able to cancel the new car deal.
Consider whether or not your state's "Lemon Law" may apply, to see if you can cancel your new car deal under this exception to the general rule. In most states the new car buyer will need the following: (1) A major defect must be discovered in the car you have purchased, and this major defect must be covered under warranty, and (2) The major defect must remain unfixed after a reasonable number of repair efforts have been completed by the dealer or manufacturer.