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Just because the lights go away the next day doesn't mean nothing happened. Sounds like you didn't bother to check for codes when it happened, so you'll never know. And the codes will go away too after a time. On the other hand, whatever did occur couldn't have been too serious or it would have made itself known sooner or later. Consider yourself lucky and, BTW, "X-mas tree dashes" aren't the exclusive preserve of BMWs. Lots of different makes do it on occasion for one reason or another.
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