If you hear a long (5 secs) tone when selecting reverse, but no pings when close to an obstruction, one likely source of the problem is superficial condensation/corrosion between the plugs and their sockets on the box in the offside rear wing, as illustrated. I find it tends to be the white, rearward plug/socket. It is usually sufficient to remove and replace the plug a couple of times to clear the problem.
Derek.
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