Remove the front bumper or the rear bumper.

Pull out the harness clamp (A) from the parking/back-up sensor (B), and disconnect the 6P connector (C) from the parking and back-up sensor.

Push the lock tab (A) with a screwdriver, and pinch the tab (B), then pull out the parking and back-up sensor from the retainer (C).

Install the parking and back-up sensor in the reverse order of removal.