Audi A6  Setting off  Doors and windows  Central locking system
If the central locking system should fail to work, you can still lock and unlock the driver's door by turning the emergency key or spare key in the lock.
If the central locking system should fail to work, the doors have to be locked/unlocked separately using the emergency key or the spare key.
Locking and unlocking the driver's door with the emergency key
Remove the emergency key Link.
To unlock the driver's door, turn the key to the unlock position -A- Fig. 1.
To lock the driver's door, move the selector lever to position P (automatic gearbox) and turn the key to the lock position -B- once WARNING!.
Locking the front passenger's door and rear doors with the emergency key
The mechanical locking device 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.
Remove the emergency key Link.
Pull the cap out of the opening Fig. 2.
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).
WARNING!
On vehicles with an anti-theft alarm system*, do not leave anyone (especially children) in the car if it is locked from the outside and the safelock mechanism* is activated: the doors and windows cannot then be opened from the inside Link. Locked doors could delay assistance in an emergency, potentially putting lives at risk.

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