Version 3:

Courtesy of AUDI OF AMERICA, LLC

-- Remove the bumper cover end plate. Refer to BUMPER COVER END PLATE, REMOVING AND INSTALLING .

-- Pry out the clamps -1-.

-- Remove the molded foam part -2- from the end panel -3-.

Installing 

Install in reverse order of removal and note the following:

Version 1:

Courtesy of AUDI OF AMERICA, LLC

-- Position the pressure hose -2- at the center of the color mark -3- in the recess on the specified marking -4- in the molded foam part -1-.

-- Position the pressure hose evenly in both directions -arrows- in the recess in the molded foam part.