The light means you should perform the recommended maintenance for your car. Whether that is as simple as an oil change or as involved as putting in a new timing belt depends on the mileage of your car. Check the manual or consult the dealer. If you want to turn the light off there is a recessed button below the dash. It's right under the steering column. When you first start the car and the light is blinking, hold down the button until the light turns off. That will reset the timer until it's time for more maintenance.