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Rear parking sensor fault on 2021 mk4 octavia - anyone replaced a sensor before?

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Hi all, hope we all had a good Xmas.

Got my car washed before xmas and drove it for the first time since the 24th today. Upon reversing, i get a message saying something along the lines of rear parking sensor - clean rear sensors with a ! next to one of the sensors on my screen.

I cleaned the sensors properly, but to no avail. I am led to believe that it got water ingress when it was being jet washed. Ive checked fuses etc and all seem OK. I have found a replacement sensor online through a link someone sent in this group (about £45) and it looks like a simple unplug, pop out and reverse jobby. What i dont know is how to actually get to it. Do i have to take the bumper off, or can i jack it up and give it the old reach around )

Thanks in advance folks!

Annoyingly I’m about to have to replace my second reversing sensor. They must be made of toffee, as they only ever get touched with finest microfibres.

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