Front parking sensor replacement help

[stephen25uk]

Evening folks, my front parking sensors on my 2016 qashqai J11 pre facelift have started faulting , a bit of research has led me to the possibility that both the centre sensors could be knackered with a water ingress which is a known fault, and as the sensors are only £22 each I’d like to have a go at replacing them myself.
Has anyone ever done this and have a how to, or is there a way to do this without taking the whole bumper off
Thanks in advance for any help

[almayb]

Mine have stopped working and I noticed one in front has a stone chip which I hope is the cause of all the sensors not working. It’s a nightmare finding the correct replacement part as there are so many and finding info on changing them is also a nightmare

[gloucester]

Finding the relevant part shouldn't be a problem at a dealer.

[almayb]

Got replacement sensor but still no go. Birds eye view camera has red marker in each corner and X across roof. When I switch front or rear sensors off it makes no difference?