A transponder chip disarms a vehicle immobilizer when the car key is used to start the engine. The majority of keys to cars built after 1995 contain transponder chips. When the car key is turned in the ignition, the engine control unit (ECU) on the car sends an electronic message to the key, and it will allow the car to start only provided it receives the correct message back. How to check if I have A Transponder Key? In most cases, the plastic part of the key will be thicker than a key without a transponder. This is not always the case, but it is a good sign. Another test is to wrap the plastic part of the key with several layers of tin foil and then try to start the car. If it does not start, there is a transponder present. There are some exceptions to this rule, but not many.
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