Originally Posted by zutorcs
1. It is expensive to replace the car key for newer model vehicles. Some dealerships charge $200 and up to replace a key. The expense is not from cutting the car key, which only costs a dollar or two in time and parts, but from programming the electronic chip in your vehicle's key. If you have a perfectly cut key without the programming for the chip, you can put it in the ignition and turn the car key but the car's engine will not start.
2. A more economical option is to buy your replacement car keys from a locksmith. They have the same key programmer as the dealership but will charge up to half the price to replace your key. As with a car dealership, the most important part of getting your car key replaced is making sure the chip inside the key is programmed properly. Make sure you test your key several times before leaving the locksmith or as soon as you get home with your new car key. Call the locksmith immediately if you have any problems unlocking the door or starting the car. If the car does not start it may mean there was a problem with the programming or even the cutting of the key and you will need to get the replacement car key replaced as soon as possible.
have the key price half of the dealer but as you said earlier , first test the many times that it must be programmed properly or not.