Table 1 shows one common visibility related problems of the 2006 Audi S4.
| Problem Category | Number of Problems |
|---|---|
| Visibility problems |
Hid xenon headlights randomly flicker and shut off during driving. It's getting worse. Dealers "never found" problem which recurs continually so they never fixed this issue under warranty after being asked several times since the vehicle was new. 100's of other stories about this online. Huge safety issue when headlights just quit at random.