You can find an instruction video on how to change an air filter at: http://www.videojug.com/film/how-to-change-your-air-filter
I'm not sure wether you mean 1) "changing the original filter for a fresh one" or 2) "change the air filter to a different sporty type" (like i.e. an open air filter).
Either way it's pretty simple: the most important part is finding the correct filter for your car (model, type, year). A paper replacement filter (the same as the factory one) costs around 20 euro's and lasts around 30 000km, a more sporty cotton/foam one with improved airflow and durability costs around 60~70 euro (will last a life time, although needs cleaning every 50 000km) and might sound a little sportier.
Then find the airbox (which in your case is the big box on right with a big hose on the left, in front of the battery, can't miss). Unscrew the 3 bolds, remove the top and you'll see the air filter. Unscrew the placeholder on the left and the air filter will just pop out. Then pop in the replacement part and screw everything back. It's a simple, clean 5 minute job.
Replacing the whole airbox unit for an open filter is nearly as simple; get the correct replacement filter, unscrew the original airbox and screw the new one in place (following the directions which come with the replacement part). This is a 15 minute job, but still pretty simple and might have a noticable effect on performance (better throttle-response and 2~6 hp more). This looks something like: http://i42.tinypic.com/2yopqwj.jpg (the purple filter being the aftermarket K&N air filter).
SOURCE: Changing the wiper motor on a 1997 Audi A3
Here you will find the replacement of the wiper motor for Audi A4. Maybe similar for Audi A3! First you must diagnose your problem. In order to find out the cause of wipers stopping you can try follows: 1. Carefully extract the wiper arms from their axles (two pieces). In some cases you need to use an extracting tool. Heed of the windscreen !!! 2. Disassemble the plastic covers from the bottom of the windscreen. 3. With the bonnet up you can start the engine, (transmission in "N" or "P" position and parking brake on). Now you must switch on the control lever of the wipers, and go to the engine compartment. If the wiper motor runs let the wiper motor running for a few minutes and switch off. Go to the step 4. If the wiper motor do not runs you must check first the electrical feeding of the motor. It is necessary to unscrew three bolts of the mechanism and disconnect the electrical coupling (difficult assurance). If the electrical feeding is OK you must replace the motor - steps 5, 6, 7. If not you must check electrical connections, the control switch of wipers and electric cables. 4. Now you must check the two bearings of wiper mechanism with your hand. In the most cases the left bearing is out of order (is very hot). This is the most encounter fault of the wipers running at Audi. 5. For have enough space to manipulation the wiper motor together with their mechanism you must extract the plastic cover of the engine computer box, and extract also the box screws. Then you can move slowly the engine computer box, just for a few milimeters. 6. You must disconnect the electrical coupling of the motor (difficult assurance), unscrew three bolts of the mechanism and extract together with the motor. You must move them slowly between windscreen and engine computer box until the wiper motor go out together with the mechanism. This is the most difficult operation! 7. Now you can repair the bearings, replace entire wiper mechanism or replace the wiper motor. It is not very simply, but it works. Heed of the windscreen !!! Refit all in reverse order. Success!
SOURCE: How to change the oil filter on an 2005 audi A3 2.0L Fsi
There should be a square hole for a 3/8 ratchet or a octagon for a wrench to remove th adapter. Some had allen wrench fittings which would be a recessed octagon
SOURCE: audi A3 2006
there is a square plastic box on the right hand side of the car under the bonnet, there is about 4-6 screws around the box , remove them , pull at the top section and it will come off,replace filter and replace screws, make sure all plastics are replaced , ant it is a good idea to hoover out box when filter is removed .
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