I looked into fitting standard 'bleeping' reversing sensors to fit myself myself last year and was told you need to remove the back bumper to fit them,
and you need four and also was told to be aware of cheap sensors and why worry about having it linked to the R - Link system which can turn out an expensive repair
if you get it wrong
So I got mine fitted by an local electrical garage for £130 which simple work when you select reverse gear
Simple and efficient and works well, bleeps from 1m distance down to continues at 300 mm
