[Image of Audi a4 vacuum hose routing diagram]
This diagram shows the routing of the vacuum hoses for the Audi a4. The vacuum hoses are used to control various components of the engine, such as the throttle body, the wastegate, and the brake booster.
The vacuum hoses are made of rubber, and they are typically black or gray in color. They are usually routed along the side of the engine, and they are held in place by plastic clips.
If a vacuum hose becomes damaged, it can cause the engine to run poorly. If you think that a vacuum hose may be damaged, you should have it inspected by a qualified mechanic.
