Talk with the dealer and the lender, maybe try and sell the car. Repossession will cost you in the long run and maybe you can refinance with someone else would could set the rates a little better for you. If you do turn in the car make sure you have a deal in writing that accounts for your payments and the costs of resale.
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I think you should use both approaches suggested by my colleagues. It is generally worthwhile to ask the creditor to cut you some slack and not report to the agencies. The fact that you are willing to try to find a solution rather than making them the costly and frustrating process of attempting collection and then repossession ought to be worth something.