2003 Alphard. Was getting intermittent beepings from my nearside rear parking sensor. On investigation found it hanging by it's cables. Thought I would just reach up and pop it back in but can't get my hand more than half way up the gap behind the bumper. Any ideas anyone? Maybe there is a way at it through the back door or perhaps the rear bumper can be disassembled? Any information gratefully received.

I loosened the bumper to fit new fog lights. The wheel arch liner pops out easily and other clips and bolts are easy to spot. You should be able to get your hand in to do the fix.

thanks graeme, job for the weekend.