You need two keys that your car has been programmed to recognize to add any additional keys. If you have only one key that the car recognizes, you will need to have the dealer program the car to recognize any additional keys using the NGS or WDS. You may want to call around to check on the price as it can vary from dealer to dealer. Roughly speaking expect to pay about $30.00 per key and about $60.00 to $100.00 labor.