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ElectricalFor discussions regarding wiring up electrical modifications such as radar detectors, brake light mods, power sockets, and driving lights in Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.
I just checked in my car and it is absolutely the 'bonnet not fully latched' sensor. Look to the latching mechanism on the passenger side. On the back is a spot for that sensor. It should plug back in. Yours does not look broken, but even if it is, it shouldn't be a very expensive part to replace.