Why can't the car key be used after replacing the shell? What are the reasons?

[CaliRose]

The reason why the car key cannot be used after replacing the shell is that the car key was damaged during the shell replacement process, causing the car key to be unrecognized when inserted into the car, thus preventing the engine from starting. Steering wheel lock: If the steering wheel cannot be turned and the key cannot be twisted, it is because the vehicle's simple anti-theft function is exactly at the intersection of key unlocking and lock cylinder torque. Incorrect gear position: For automatic transmission vehicles, the gear must be placed in "P" (some models include "N" gear) to start. Some cars cannot even remove the key if the gear is not in the "P" position. Vehicle malfunction: If the car still cannot be started in the P gear, or the dashboard shows abnormal gear indications, it is recommended to seek repairs promptly, as it may be due to a damaged electronic gear sensor or electro-pneumatic valve.