Do it yourself, change the cabin air filter on your Audi A4, the model that was produced in the years 2002, 2003, 2004, 2005, 2006, 2007 and 2008. You can make this replacement pretty easily and you won’t require tools. Servicing this filter will probably take you less than 5 minutes.
Audi A4 and Audi A4 Quattro cabin air filter location. From year 2009, 2010, 2011, 2012, 2013. Here you can find how to locate Audi A4 and Audi A4 Quattro pollen filter when you need to replace.