Audi A3  Setting off  Towing a trailer  Removable towing bracket
Applies to vehicles: with removable towing bracket
The two fasteners for the cover are located on the underside of the bumper Fig. 1.
Remove the cover from the rear bumper. To do so, turn the two fasteners 90° anti-clockwise Fig. 1.
Remove the plug Fig. 2 from the mounting fixture.
Check that the mounting fixture is free of dirt; clean if necessary WARNING!.
Continued Link.
WARNING!
It is important to keep the mounting fixture clean. Otherwise the ball joint may fail to engage securely (accident risk).

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