I have a 2005 B7 S4 Avant with a bit of an odd issue...
The main beam nearside headlight was doing odd things. It would flicker on and off, and then switch off for 5-10 seconds before coming back on as normal. No pattern - completely random.
So, I've replaced the bulb with a brand new one (Phillips or Osram, forget which), and now with 0 and 15 minutes of driving the warning light will come on the dashboard for that bulb.
The bulb is now rock solid (no flickering etc) - but the damned warning light is now causing the issue.
Any ideas at all as to what this could be???