Sounds fishy. They may be asking you to sign a new contract to charge you additional monies or a higher interest rate or even the condition of the car. If you paid monies in, you need to find out exactly what is going on, explain you wish to review the new agreement and compare to the one you already have and if you don't get a warranty on this, you need to get an immediate refund and move on. Consider simultaneously filing a complaint with the agency in your state who regulates used car dealerships. What you need to remember is that unless you have already obtained a written warranty or guarantee on the car, you bought it "as is" and may only have the limited state warranty required by used car dealers in your state.