Contact Corrosion

WARNING: This page is about a different car, the 2025 Audi A4 allroad and 2025 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Contact corrosion can occur if inadequate fasteners (bolts, nuts, washers, etc.) are used. For this reason, only fasteners with a special surface coating may be installed.
Original replacement parts and accessories that were developed and tested for their intended purpose are recommended.