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The pad sensor is a piece of plastic with a metal strip in it. All it can do, is measure a short circuit (to the brake disc) or a broken strip (by the brake disc). For this to happen, the pad must be worn down almost to the back plate. As long as the plastic housing is not damaged, I think it is safe to reuse it. But I don't know for sure.
In some previous cars, I have replaced the pad sensors with a short circuit link directly in the connector, just to avoid warning lights.
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