Yes, it is possible to delete the old maps. I have seen the directions to do so as an option before doing the update. You'll have to Google the specifics.
I had the same thing happen in my 2015 2.0 A3 in the middle of a Florida torrential down pour. Pulled over, turned the engine off and restarted and the light went away. Brought it to dealer the next day and they found nothing and thought I may have gotten some bad gas. I've put on about 2000...
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