Amgc63black

Hi all usual fault indication on PTS 2 red led’s front and rear. Plugged icarsoft cr pro into car and had code 924E95 parking sensor 3 has malfunction. But I noticed when I watched distance values on diagnostic tool all 4 rear sensors moved from 255cm down as objects got closer which is correct in my eyes. But when running the same test on front sensors none of the 6 sensors distance readings moved from the 255cm settings. I would have thought only sensor number 3 wouldn’t change state due to fault or does system just bloke the lot on either front or rear ? Any input would be much appreciated.