CHANGE THE AIR FILTER
Audi says the manual mateniment that changing the air filter must be performed every 30,000 km.
The original air filter is as follows:
AIR FILTER: 1J0 129 620
Most of these parts can be found on-line stores on the internet, such as : Oscaro
The box was placed on the air filter is located on the right side of the engine.
To open the box, you must loosen the tube clamp it in the box, remove the MAF Sensor connector and unscrew the 2 screws from the box.
Here we see the appearance of the old filter and is hosted as a new filter.
To close the box, follow the same procedure in reverse.
Thanks to : http://www.autobricos.com