Rear Sensor, Removing And Installing: Removing

-- Remove the rear bumper cover. Refer to REAR BUMPER COVER, REMOVING AND INSTALLING .

-- Press both tabs in the direction of -arrows- to the side and press the sensor -1- inward from the outside.

Fig 1: Removing Front Sensor

Courtesy of AUDI OF AMERICA, LLC

-- Disconnect the connector -2- by sliding the retainer -3- toward the rear and pressing the release down.