My CT200h is fitted with Park Assist.
On the front bar there are two sensors one on each corner but there aren't any sensors on either side of the license plate. From my experimenting, the absence of these two sensors prevents any warning if you get too close to say a wall or a car parked in front:
However, on the rear there are two sensors in the middle of the bar below the license plate in addition to the two sensors on either corner,
Any else notice this?
In my picture above I've circled the two corner sensors and the black boxes are where I would have thought there ought to be two more. I happen to notice on a GS Lexus which I presume has park assist and it has the two additional sensors on the front.