take off ONLY the 'V6' engine cover (not the '5V' ones). Then you should see down the sides there are 3 HT leads going down each side. (if not, then i maybe forgetting some more covers or something needing to be removed). Take off each HT lead. Then, using a long spark plug wrench/remover, place the wrench down the tubes which hade the HT leads in, and move around until it clicks in, then screw counter-clockwise until the spark plugs are unscrewed. Then you can take the spark plug out.
You Might Have To Buy A New One.
The only way to change the plugs is to remove the top cover first. Then remove the cover for each plug.
The 2009 Audi A6 has 24 valves.
The 2010 Audi Q7 has 24 valves.
The 2011 Audi S4 has 24 valves.
The 2010 Audi A6 has 24 valves.
The 2011 Audi A6 has 24 valves.
The 2009 Audi A5 has 24 valves.
The 2014 Audi A8 has 24 valves.
The 2007 Audi Q7 has 24 valves.
The 2013 Audi S5 has 24 valves.
The 2014 Audi Q7 has 24 valves.