If you don't know how to start a job like this your safest method is to pay a good mechanic to do it for you. Describing how to do it would take too long writing it down.
SOURCE: How to depress rear brake caliper piston on an 2004 Audi A4
It must be turned clockwise while being pushed in. The local parts store will have a tool just for this purpose.
SOURCE: Audi A4
Not sure if they've changed it but this is what i do for my 99 a4
First remove the screw in the handle pull, it should be next to where your fingers go.
Pull down on the black piece of plastic and remove the screw form the door
Then remove the screws on either end of the door, one near the door jam on top and one near the other side, same place.
Finally pull up then out and the door panel should come out
Hope that helps
SOURCE: where is the 2004 audi a4 rpm sensor
For Diesel and also for Otto engines on 2004 Audi A4, this rpm sensor (impulse sender - crankshaft) is placed on the bottom left back side of the cylinder block. 
Please Rate my Response! Thanks!
SOURCE: 1999 audi a4 oil reset light
Turn off the ignition press and hold the button on the leftside of the display while turning the ignition on it should say service oil on the display pull out the button on the rightside of the display until the service oil clears
67 views
Usually answered in minutes!
×