Brake wear sensor error

Howdy folks, have a strange one. When I bought my car it had a rear break wear sensor error present. Checked wear sensor and looked fine, but replaced with spurious,attempted reset through clocks and Carly but error will not clear. Replaced again with OEM, cleaned all contacts on pads/checked plug is seated and for corrosion etc, and same result. Error appears again immediately after reset. Have tried a few things like resetting with handbrake off etc, checked wires ( have not removed inner splash guard just yet)

Anyone with similar issue or suggested fix before I head to garage with it

Dave

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