Not sure what the "return" requirements are for the car dealer, but having your paperwork for a faulty, or lemon, would be a good idea. how else will you be able to make the dealer stick to the conditions contained in your agreement, if you don't know what the conditions are?
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Take all the papers. Hopefully you are familiar with the terms of the purchase. Without seeing the documents and having more information, it is not possible to comment on what might happen.
A person always need to keep paperwork with any large purchase, particularly a motor vehicle which involves an asset transfer, registration, bill of sale, usually a loan and financing agreement and possibly others. Do not relinquish them! Keep copies for yourself safe from damage. Claiming Lemon Law rights requires documentation of repair attempts. If you are still uncertain, be sure to contact a good lawyer who has had experience in this area. I spent 15 years in the car business.
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