I have had a quick look at getting to the RHS sensor. It looks like a prize PITA. Are there any tricks?

BTW I have a scan gauge that shows no codes..... Also I had to move the car on the weekend. I ran it for about 5 minutes with no unusual sounds. (I'm looking for an excuse to install a V8 diesel )

So I'm fairly confident that there is oil pressure...... So starting to think that I definitely have a dodgy RH sensor.