The 2012 Audi A3 runs on premium unleaded (required).
The 2013 Audi A3 runs on premium unleaded (required).
The 2011 Audi A3 runs on premium unleaded (required).
The 2009 Audi A3 runs on premium unleaded (recommended).
The 2006 Audi A3 runs on premium unleaded (required).
The 2007 Audi A3 runs on premium unleaded (required).
The 2008 Audi A3 runs on premium unleaded (required).
The 2015 Audi A3 runs on premium unleaded (recommended).
The 2010 Audi A3 runs on premium unleaded (recommended).
maf combined
It tells the injector to fire at correct time
The 2009 Audi A3 has 16 valves.