My car likes to throw those stupid error messages. im on 100% stock bulbs (except for the headlight bulbs). Basically what is going on in there is the filament is probably getting ready to go(or you have a bad connection) if the filament loses temporary contact inside the bulb, it will show an open circuit and throw the error message. that message will probably stay there until you reset it or change the bulb and reset it. Mine kept doing that and i could never catch the bulb when it wasn't working. Like the elusive unicorn. I was a little worried, but one time it came on I pulled over rather quickly and ran to the back to look at it. One of my license plate lights was out and i caught it not working. And in good ol Audi fashion, it started working again. Error code is still there when i press the check button, but who cares. I'll change them out soon. Might as well just buy all new bulbs for the rear of the car and change them all out at one time. If you don't, you will be in and out of the rear end multiple times, because that's what Audi's do. lol. Just my .02
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