If it is the one that the screwdriver is pointing at in this picture it is for the traction control. It wasn't fitted in my ZT and may not be in yours either. It is a nice moulded BMW marked plug.
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ZT-T190, Anthracite, LHD, Left the Line on June 24, 2002,
Sold new in Switzerland, spent time in Germany, Imported to Canada in September 2021
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