Rear Ultrasonic Sensor Removal/Installation

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the rear combination lights. (See REAR COMBINATION LIGHT REMOVAL/INSTALLATION .)
Remove the rear bumper (See REAR BUMPER REMOVAL/INSTALLATION .)
Disconnect the connector

Fig 1: Rear Ultrasonic Sensor, Rear Corner Ultrasonic Sensor, Rear Bumper And Connector
Courtesy of MAZDA MOTORS CORP.
While pressing the rear ultrasonic sensor tabs in the direction of arrows (1) shown in the figure above, pull the rear ultrasonic sensor in the direction of arrow (2) to detach the rear ultrasonic sensor tabs from the bracket.

Fig 2: Pressing Rear Ultrasonic Sensor Tabs
Courtesy of MAZDA MOTORS CORP.
Remove the rear ultrasonic sensor.
While pressing the bracket tabs in the direction of arrows (1) shown in the figure below, push the bracket in the direction of arrow (2) to detach the bracket tabs from the rear bumper.

Fig 3: Pressing Bracket Tabs
Courtesy of MAZDA MOTORS CORP.
Remove the bracket.
Install in the reverse order of removal.