Two types of lights...the LED tail-lights, and the brake lights. All four segments are tail-lights (two LED strips) and the outer two lenses are the combination brake/signal lights. The inner two lenses are the adaptive brake lights / rear fog lights.
If your inner tail-light lenses are not working, you've burned out the LED(s), and require a replacement (as I am for one of my outer lenses).
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Richard
2013 BMW M3 Individual -- Fire Orange (sold)
2013 BMW X1 xDrive35i M-Sport -- Valencia Orange (sold)
2011 BMW 1-series M Coupe (#205/220) -- Valencia Orange (sold)
2009 BMW 135i M-Sport Coupe -- Space Grey (sold)
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