Foreign Objects In Engine
WARNING: This page is about a different car, the 2018 Volkswagen Jetta, 2017 Volkswagen Jetta, and 2016 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
Any open intake or exhaust channels must be sealed with plugs whenever working on the engine to prevent contaminants from entering it.
Seal for example with suitable plugs from the :VAS6122 .