Contact corrosion!
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
General:
Contact corrosion can occur if non-approved fasteners are used on vehicle (bolts, nuts, washers, etc.).
For this reason, all fasteners used in production are specially treated. These parts can be identified by their greenish color.
Rubber, plastic and adhesives also consist of non-conductive materials.
If you are not sure whether used parts can be re-installed, always install new parts.
The following points should be observed especially for transmission:
- Multitronic transmission 01J or 0AN housing is made of magnesium alloy.
- Bolts and other components which have direct contact with transmission have a surface coating which is matched to magnesium transmission housing.
- On magnesium transmissions, bolts must always be replaced on following bolted connections: Transmission housing cover and final drive cover on transmission housing as well as engine bolts on transmission.
- Contact corrosion occurs when incorrect components (bolts, nuts, washers, etc.) are used. The transmission housing will be damaged.
- Transmission housing, transmission cover and differential cover must all be of same material.
- If you are not sure whether used parts can be re-installed, always install new parts.
CAUTION:
- Accessories must be approved by AUDI AG!
- Damage resulting from contact corrosion is not covered by the warranty!