First read and observe the introductory information
and safety warnings
The underside of the vehicle is coated to protect it from corrosion and damage. The protective coating on the underside of the vehicle could be damaged when driving. Volkswagen therefore recommends that the protective coating on the underside of the vehicle and on the running gear should be checked regularly and repaired if necessary.

CAUTION
De-icing door lock cylinders
Cleaning the engine compartmentTires, Dismounting
Remove the valve insert.
Note
If equipped handle the glued-on wheel trim carefully.
Surface slightly scratched.
Replace the damaged rim wheel trim.
...
Brush Grinder Set -VAS6776
Definition:
Brush Grinder Set -VAS6776-
Product Description:
The device is used to clean surfaces and remove corrosion in
hard to reach areas. For example, it is suitable for joints,
grooves, ...
4-Pin Heated Oxygen Sensor (HO2S), Removing and Installing
Note
Do not repair the heated oxygen sensor wires. Repairing may
result in malfunctions.
Use the faulty sensor as a guide for installing all of the
accompanying attachments, cable ties or marking bands.
...