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one of my headlights doesn't work on my s3

Discussion in 'A3/S3 Forum (8L Chassis)' started by nath-w, Mar 11, 2009.

  1. nath-w

    nath-w Member

    Mar 5, 2009
    Likes Received:
    got some new bulbs today because i thought one of mine was gone. however when i came to change them the new one didn't work. so i put the bulb i thought had blown in the other headlight and it worked. is seperate fuses on each headlight circuit. im confused as to what it could be??
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  3. Nilz

    Nilz Defo worth the wait :)
    Team Silver Audi S3 Audi Sport Owner Group

    Apr 9, 2006
    Likes Received:
    Could be the ballast, the power unit that is used to light the xenon.

    They can go faulty and are a known fault.

    Have you had it on VAGCOM, if not, it might be worth getting it on there...
  4. bantam1

    bantam1 Member

    Aug 15, 2004
    Likes Received:
    Yep could be the ballast - if you switch headlights on, wait 10-15 seconds after bulb warning indicator comes up on DIS and then switch off and on again immediately it may well come on (as some charge stored up i think which is enough to ignite the xenon). If this is the case then prob the ballast at fault.

    I have a spare unit going as have same fault and bought a pair of aftermarket ballasts off forum member Ibzzz here. Let me know if that turns out to be it and you want it.

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