Audi A3  Setting off  Doors and windows  Central locking system
If the central locking system should fail to work at any time, each door will have to be locked separately.
The driver's door can be locked manually by turning the key in the door lock Link.
The mechanical locking device for the other doors is located on the end face of the front passenger's door and the rear doors*. It is only visible when the door is open.
Pull the cap out of the opening.
Insert the key in the slot inside and turn it as far as the stop to the right (if the door is on the right side) or to the left (if the door is on the left side).
Once the door has been closed it can no longer be opened from the outside. Pull the interior door handle once to unlock and open the door.

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