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Remove inner door panel for access
One does not simply take the radio out of a 1999 c230 kompressor.
You need to remove the Door Panel and you can reach the attaching nuts from there.
It is important to know the capacity for the fluids in a car. For a 1999 Mercedes c230 Kompressor has an engine oil capacity of 6.1 quarts.
a 2.3 liter 2300cc gasoline powered engine, after 1999 the 230 is called a 230 kompressor when supercharged. Kompressor is German for Supercharged so all Kompressor models are supercharged.
Lift up on the handle. You should see plastic inserts that fit into two tiny holes. Remove the inserts and the handle should slide to the side.
With a hammer and pry bar.
no sweat,undo the bolts around the door they are 30 torqs bit,remove the outer handle which has a small clip than you pull the handle to the side to remove than with the window open shut the door and the panel will come strait off.
secondary air injection system
you must use a wedge on the outside above the handle to see inside and then use a coat hanger or something long to pull the handle rod
you need to remove the screw directly behind the door handle, then rotate the cover off the handle then pry the clips around the outside of the door and pull up. to put it back on you just reverse what you did to take it off
remove the srews in the handle and sometimes there behind the light on the door, then left up on the panel and its off