Wasn't there a class-action lawsuit settlement for all the modern Audi's regarding front sunroof and front plenum drain problems? I got a letter about it from Audi. I would think you could get this taken care of for free by Audi. Call AoA customer care and ask them about the settlement in regards to your issue. They are very nice to talk to, just have your VIN handy so they can look it up.
That said, I fixed this once on an A6. It was the drain under the battery clogged with leaves and debris. Also, the plastic rain tray wasn't sealing well with the windshield (aftermarket windshield's clip interface for the raintray was a lousy copy at best). This caused water to go straight through the cabin air filter an onto the passenger floor.
If could also be the front sunroof drain.
If you've got a tiptronic you had better fix this ASAP before it kills your Tranny computer which lives under the passenger side carpet.
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