| Re: 2006 DTS Performance HID Headlight issue...
We do see problems like this with the "bulb". (arc tube)
If I see one shutting off I replace the bulb and I haven't heard many complaints after that.
The HID light uses only one bulb. Older halogen systems had 2 separate bulbs. The knock noise when you hit the high beams is a mechanical door flipping up to expose more of the light beam. If you pull up to a wall in the dark you can see it as it changes position. Once the lights are struck they stay on and the flippers flip up or down whether you want high or low beams.
Yes they are a genuine PITA to change.
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