The method of matching car keys in the 4S shop is to first send the data of the vehicle frame number, engine model and so on to the car manufacturer, and then send it back to the 4S shop after confirming the chip content of the key, and then the 4S shop uses the diagnostic instrument to match the key and the engine computer.
This method costs time and money, it takes about a week or a month, and the more advanced the vehicle, the more expensive the matching cost.