09-11-2018, 10:40 AM | #2 |
First Lieutenant
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Drives: 2013 335i, ‘08 328i, ‘03 316ti
Join Date: Jan 2013
Location: US & Germany
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This is most likely one or both of the Adaptive Brake Lights. They only come on during a very forceful (emergency) brake maneuver, so you really can't check the functionality like any other bulb. This happened to my old e83 quite a few. The lights are located in the tailgate and you have to remove the big plastic trim panel to access them. It's quite a pain to put back in place because the plastic clips are hard to line up right and have a tendency to get smooshed and mangled. So make sure you have plenty of them on hand when you do this.
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