I have an 2006 Audi A4 B6 1.8t FWD with ~210,000 miles. She is running well but throwing codes mainly related to the turbo (which works but apparently not up to spec). I have largely solved these problems by putting black electrical tape over the yellow light. I noticed a very small amount of loil/coolant eaking under the car on the drivers side near the front of the car. The breather hoses under the manifold appear damp. I note that the breather hose coming off the manifold appeared largely blocked with gunk -oil/grease? My original plan was to replace all these hoses - at least those that come in a breather hose kit. I had some access to these hoses by removing the coolant tank but think I would have to remove the manifold to do this job? Beyond the hoses, is there any else that often fails which might be fixed while I am there? I am also willing to fix other issues related to this problem which are fairly accessible. The Audi is my daily driver so I do not want it inoperable for long periods of time. Your thoughts/help are appreciated.