Last time I had this was on my d3, a bulb change had the lamp carriage not seated back correctly allowing moisture in, maybe as simple as that if had any bulbs changed?
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2021 Q7 4M, 3.0tfsi MHEV Black Edition
2002 D2 S8, Aqua Blue Pearl, original bar FE alloys and miltek
1997 D2 PF 4.2q, silver, Sport on roughly 90k and counting…. ** FOR SALE **
1990 2.3 20v 7a Coupe Quattro
**SOLD** 1996 2.6 v6 cabriolet, Isis red metallic
**SOLD** 2014 D4, FL 3.0tdi, phantom black, sport exec lwb
**DEAD  ** 2009 D3, 3.0tdi sport, black
Had a few Audis over the years, mostly early stuff, newest was a D3 prior to my D4, nothing much kept me smitten with other marques so I floated about a bit from one thing to another until that four ring lure caught hold
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