WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.
Remove the center section of the rear bumper cover.
Courtesy of FORD MOTOR COMPANY
Disconnect the hands-free liftgate actuation upper sensor electrical connector.
Courtesy of FORD MOTOR COMPANY
Remove the hands-free liftgate actuation upper sensor.