If you have brights working and all fuses are fine, its the bulbs.
Replace both of them with brand new bulbs. I had same problem and
believe it or not its enough of a coincidence to have both blown at the
same time... simple electrical fixes can cure other problems in these
high sensitive Audis we have. :-)
Turns out it was the ignition switch. There is a known issue with wire
shorts in or near the switch related to accessories that run while the
engine is running. My AudiShop disassembled, rewired the short and fixed
the problem for less than $200.
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