Hi. I recently purchased a 2001 Audi a4 quattro and after doing some tune ups i notices some missing connections. One is right under the coolant tank. The other is to the left of the coolant tank. The last one is by the spark plugs on the left side. I don't know what they are for maybe some can help me out or provide a schematic. In the first pic its the really oily hose with a wire running in front of it. the hose is not attached to anything. The other 2 are pretty visible but ask questions if your unsure.