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What is the sensor on the rear view mirror facing forward on the passenger's side?
There's a pocket about the size of a dime on the rear view mirror facing forward on the passenger's side. Does anyone know what it is?
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'11 X3 xdrive28i
'07 X3 3.0si
'08 328xi (sold)
'04 325xi (sold)
'97 328iS (sold)
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