Go to the dealership and be sure to take a copy of the registration (it has the VIN number on it, and that's the number they need to get the correct key). They should be able to give you the correct key. When you get it, ask the dealership if the key has a microchip in it. If it does, you'll have to get ALL your keys from the dealer and they'll have to be coded before you can use them in your car. If it doesn't have a microchip, you can just get one key from the dealership and get copies made at your local hardware store.