If you lose the keys to your car, consult with your local car dealer and your local locksmith. Sometimes the cheaper option is to go through the dealer, because sometimes they can get the keys even cheaper than the locksmith, however the dealer cant come to you, and your locksmith usually can. If the key uses a transponder or similar system, you will need to have the cars computer programmed to accept new keys, this would mean towing your vehicle to the dealer or having a locksmith with the equipment come to the vehicles location.