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If it the the newer body style the flasher is built in to the emergency flasher switch. Replace that and it is fixed. If it is the A3 body style it will be a relay in the relay box. Any VW parts person can tell you the exact location in the relay box.
It's built into the hazard light switch. The hazard light button will slide out, with the relay (small box) attached.
above the drivers feet, you must remove the casing and the relay panel is to the left.
The replacement window costs $95 from Audi and the dealership gets $287 for the labor to install.
The 2009 Audi A3 has 16 valves.
The 2007 Audi A3 has 16 valves.
The 2008 Audi A3 has 16 valves.
The 2006 Audi A3 has 16 valves.
The 2010 Audi A3 has 16 valves.
The 2012 Audi A3 has 16 valves.
The 2013 Audi A3 has 16 valves.
The 2011 Audi A3 has 16 valves.