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Discussion Starter · #1 · (Edited)
Hello fellow Audi owners, I am hoping that one of you can help me with a headlight assembly question for my 2008 TT convertible with Xenon HID headlights.

The driver side headlight stays on bright/high beam and will not go to dim. It just stays on steady high beam. The ballast is good (I have swapped it), I have a new D3S direct fit bulb replaced (I have swapped it with another one too), and the light switch on the steering column is good. All plugs and connectors are also good.

Not wanting to spend $500 on a light until I have exhausted everything, what is there internally to this assembly that may have gone bad or need replaced if I open it up? Are there any components inside that could have failed? Am I missing another piece of the puzzle?

Car Vehicle Hood Grille Automotive lighting
 

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Discussion Starter · #3 ·
Have you run a scan with VCDS? Any errors reported?
There were multiple errors related to the lights (probably because I pulled them out for a while) but the main one that keeps coming back is driver side headlight bulb. It keeps popping up even though I changed the bulbs in both lights. I have a new ballast on order and once I get it installed I'm hoping (fingers crossed) that it's my issue. I have tried EVERYTHING with this problem and I have another post going with much greater detail and a lot of replies, but so far the problem is still, well, a problem.
 
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