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HiCar is currently having some work done and I found this when I removed the rear bumper but it doesn't seem to attatch to anything It's on the offside or right side of the rear behind the bumper
Is the tube hollow or solid?
If hollow my WAG is the battery gas vent tube.
If it's got wires in it the only thing I can think of is the parking sensors. Mine does not have a battery vent tube that I've noticed, but I have not poked around in there recently.