I have a feeling that it's some kind of air quality sensor? I seem to remember puzzling over that box when I was having a nose at my TCU (transmission control unit).
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend)
2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend)
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