On my Wifey's Octavia II (54 reg), one of the rear parking sensors has disappeared inside the bumper :-(

Is there an easy way to gain hand-sized access to pop it back in, or are there instructions for removing & refitting the bumper?

Is it worthwhile applying a small dab of superglue to retain the sensor?

If you lye on the ground and reach behind the bumper you might be able to access is, especially if its the centre ones. I had to swap the cables on mine before and was able to unclip them this way.

Maybe worth finding out how they pop back in so you don't break in

IIRC Flynntech has a picture post before about towbar fitting which showed bumper removal.