“Key Coding “as the word itself suggests; includes a physical key and the process of matching the key to the car.
In Late 90s manufacturers all around the world started making the car systems more secure by adding immobilizer system in the cars. The process included adding a transponder chip in the car key; which then emits a signal to the receiver of the Car ignition system. If the signal emitted by the transponder chip in the key is detected as “Wrong signal”, by the ignition system- the car won’t start.