WARNING: This page is about a different car, the 2018 Volkswagen Passat, 2017 Volkswagen Passat, and 2016 Volkswagen Passat. However, it is still accessible from the selected car via links, so may be relevant.
Close off any open intake or exhaust channels with plugs whenever working on the engine to prevent contaminants from getting in. Use the plugs from :VAS6122
.