What are the reasons why the car door key cannot be turned after insertion?

[LaJoshua]

There are several reasons why the car door key cannot be turned after insertion: 1. Incorrect operation: For example, turning the key in the wrong direction. In most cases, turning the key clockwise unlocks the door, while turning it counterclockwise locks it. You can refer to the car's user manual for detailed instructions. 2. Problem with the lock cylinder: Owners often use the remote key to unlock or lock the car door, rarely using the mechanical key. If the keyhole is not used for a long time, the lock cylinder may rust. You can try adding some engine oil to the lock cylinder to lubricate it and see if it can be opened. If it still cannot be opened, the lock cylinder needs to be replaced. 3. Problem with the mechanical key: In most cases, the mechanical key does not have major issues. If there is a problem, it might be due to a later duplicated key that is incomplete. In this case, the key needs to be re-duplicated.