High Tone Horn -H2- /Low Tone Horn -H7-, REMOVING AND INSTALLING: Removing

-- Turn off the ignition and remove the key.

-- Remove the lock carrier cover, refer to Front Bumper .

Left horn for vehicles through MY 2013: 

-- Remove the bolt -2-.

Fig 1: Identifying Horn

Courtesy of AUDI OF AMERICA, LLC

-- Unclip the bracket -1- from the radiator grille.

Continuation for all: 

-- Remove the nut -3-.

-- Remove the horn -4- from the bracket.

-- Disconnect the connector -5-.