In the early 2000s, automakers began to introduce “smart” key systems that employ enhanced radio communications and multiple antennae to detect when the key fob is near or inside the vehicle. Some cars allow you to program new keys yourself, but many require a visit to a locksmith or dealer with special equipment. Replacing a transponder key is similar to getting a mechanical key cut, except the key blank is more expensive and the vehicle must be programmed to recognize the new key before it will work. Transponder keys continue to be used on many new cars today. Newer versions have two-way vehicle communications and an added “rolling” security code that changes with every engine start. If it doesn’t match one programmed into the security system, the engine won’t start. When the ignition is turned on, the vehicle electronically probes the key for its ID number. In the mid-1990s, “transponder” keys debuted containing a microchip with an encoded identification number. ![]() If the resistance value of the key pellet was incorrect, the car would not start. They contained a resistor pellet that completed a circuit to the car’s security system. It wasn’t until the mid-1980s that the first electronic vehicle anti-theft keys appeared. A few automakers today even offer apps that enable your smartphone to act as a car key. As part of the ongoing war against auto theft, modern car keys use microchips, secret codes and even radio communications to help protect your car from unauthorized use. But have you ever considered that it may also be the best tool to prevent your car from being stolen?Ĭar keys were actually created as a theft-deterrent soon after the birth of the automobile, and as both vehicles and thieves became more sophisticated, keys have had to keep up. ![]() You may think of your car key as little more than a tool to start the car.
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