Making a key copy from a Transponder key is easy, if it is done by a professional locksmith. When you loose or damage your Transponder key, creating a new key takes a bit more work and it's more costly too.
This picture shows the damage done to a Transponder key, the owner drilled a hole and broke/damaged the transponder inside of the key, therefore, the keys is defective and will not start the car:
The top head hook of the key broke, so I guess he made the hole to put the key in the key ring, causing damage to the Transponder key at the same time.
The Transponder chip is so small and varies in size and position from car to car. Different types of cars have different types of chips and sizes. Transponders chips are not compatible with different cars, each car year and model has a specific type of transponder chip.
For that reason, I also do not recommend people to buy Transponder keys on the internet like on Ebay. It has a small price tag, but for most of the times, the keys do not work or do not program. Sometimes, these key blades are not even in the right side or thickness and when cut, it won't work.
Get your keys from a dealer or a professional Locksmith.
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