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There is a chip inside the car mechanical key, which is used to communicate with the anti-theft computer when the vehicle starts, to ensure that the identity verification between the key and the anti-theft computer is successful, and then the engine computer board will control the engine to start.
The key also has a chip, not as big as a big grain of rice, only about 1\/3 of the size of a big grain of rice, looks like a coil like something, the color is brown, on the edge of the metal and plastic contact part, look carefully can see, generally not easy to lose.