Next I disconnected the blue connector from the module, which is responsible for the front sensors.
I got the error that 4 front sensors were faulty and one rear.
I was kinda confused why a rear sensor is showing an error when only front ones are disconnected.

So having pressed the PDC button, the rear sensors started making the clicking sound, except the one which showed errors.
So I swapped the sensors around and turned our the one rear sensor was back.
So I borrowed one sensor from the front and installed it in the back. Now all sensors in the back were clicking and the error about rear sensor went away.