Hello, I'm new here and I have a few questions.

My wife has a 2003 C230 coupe with the 4 cylinder Kompressor engine. It surges at idle and the Check Engine light comes on. Right now I am trying to determine if the problem is a vacuum leak.

Is this car a "W203" model? I don't know the codes.

Where can I find a drawing or schematic of the vacuum lines?

David