I believe the hid bulb has gone in passenger headlamp as when I switch it on, it lights for about .5 a second then goes off and warning light comes on dash.
After a quick search on here I have found people seem to have been buying bulbs in link below
Audi S3 HID Xenon 2 Replacemnet Bulbs Set D2S 6000K | eBay
Are these any good as they are a lot cheaper than the dealers or Halfords prices but my main concern is if they cause the error light to remain on or they are useless (they do seem very cheap) if they are ok I will order some but as I have never changed hid bulbs before it would be nice to get some opinions on which bulbs first.
The headlights are standard and the bulbs are the original ones in there I presume (2002 facelift S3) I realise if I swap a bulb in these I will need to do both in order to keep the same colour shade as they do dim over age from what I have read on here.
i will have a look at swapping the bulbs over n/s to o/s on Sunday just to make 100% sure it is the bulb and not the ballast (hope it's not as these are no doubt silly money)
on a brighter note I can change the side lights to led at the same time to match if anyone has a good place for these which would match nicely with the hids so they don look yellow ;-)