When a car key is called a transponder key, that means there is a chip (a transponder) in the plastic top of the key which sends and receives a signal from the cars computer, and allows the ignition to be turned on, ONLY if the transponder matches the car.

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Transponder keys provide an extra security to your car. They contain a very small computer chip inside them which is used to authenticate the original car key and the duplicated car key. When you plug it into the ignition, the Engine Control Unit (ECU) will send a coded message to the key.The key, if it is an original one, will receive the coded message and will respond back to the Engine Control Unit. Only once when the messages are authenticated by the car, your car will start.


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