Audi A5/S5   General maintenance   Checking and topping up fluids  Filling the tank
The tank flap can be released manually if the central locking system should fail to operate.
The manual release mechanism is located behind the side trim on the right of the luggage compartment.
Opening the side trim
Insert the emergency key or a screwdriver Link (or similar tool) into the gap at the top right of the side trimFig. 1.
Lever the trim off upwards.
Releasing the tank flap manually
Release the ring Fig. 2 from its holder and carefully pull the ring Caution!. You should now be able to open the tank flap in the usual way Link.
Caution!
Pull the ring only until you feel resistance; otherwise you may damage the manual release mechanism (you cannot hear it releasing the tank flap).

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