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3400 Auto Sales & Service offers guaranteed credit approval for every single customer. Better yet ONE WEEK MECHANICAL WARRANTY, 25% off of mechanical labor, free flat tire repairs, fuses, light bulbs and free diagnostics..  For any work the vehicle is to be brought to 3400 14th Street Plano Tx 75074 by the customer, this warranty can’t be used at any other service and repair shops and 3400 Auto Sales & Service will not homer the payment at any other repair shop.