Why Can't the Car Mechanical Key Open the Door?

[HarrisonFitz]

The reasons why a car mechanical key cannot open the door include incorrect operation, issues with the lock cylinder, or problems with the mechanical key itself. A common issue with the lock cylinder is rust inside it. You can try injecting some engine oil into the lock cylinder to lubricate it and then attempt to open the door. If this fails, the only solution is to replace the lock cylinder. The door lock structure of a car's central locking system uses mechanical latches to secure the door. If the door is not locked, you can simply use the exterior door handle to open it. Conversely, if the car has an interior unlock button, you need to enter the vehicle and start it to unlock the doors. In cases where the door cannot be opened due to this configuration, you may have to break the car window to gain access, which can result in significant damage.