Details about how to match the codes of car keys are as follows: 1. To match the new remote control key, you need to match the code on the original car: each remote control key will have a code, which will also exist in the car's anti-theft system. 2, 4s shops and big repair shops can match car keys, the difference lies in the price: the key matching code should be matched according to the number of teeth of the vehicle. 3. The digital code on the car key is the factory password of the car key: the tooth number of the car is used to match the key code, and the tooth number is the tooth type of different car keys in order to prevent the car from being stolen when the car manufacturer manufactures the door lock and ignition switch.