Xenon Headlights - Audi A4

Honest John Back Room » Technical matters
View Threaded
Mon 4 Sep 2006 20:11
Xenon Headlights - Audi A4 - Aretas
On my A4 I noticed one headlight glass was fogged up. Later I realised the Xenon headlight on that side was not functioning. Further investigation showed that a plastic access hatch at the rear had broken.

Rather strangely, the light has now decided to work, and I have replaced the broken hatch to seal the unit again.

Could the fault simply be ingress of moisture, which a hot and dry day yesterday has dried out?

Or does anyone have any other ideas? The bulb is obviously okay, but is there any history of faulty ignition units? I am aware that they operate at a very high voltage, but I would have thought they would be sealed from any moistuer problems.

Thanks for any ideas.
Reply | Report as offensive | Link
Mon 4 Sep 2006 21:36
Xenon Headlights - Audi A4 - Glaikit Wee Scunner {P}
I lost the rear cover on a Passat , bulb type,headlamp. It fogged up as you described.
I dried it out using a hairdrier and fitted a cover. Been all right since.
--
I wasna fu but just had plenty.
Reply | Report as offensive | Link
Tue 5 Sep 2006 00:04
Xenon Headlights - Audi A4 - Aretas
GWS - thanks, but I am really looking for any experience anyone has had on the effect of moisture on the Xenon high voltage system.
Reply | Report as offensive | Link

Looking for a garage you can trust? Honest John's Good Garage Guide has thousands of reader recommended garages, plus how-to guides and tips on servicing.

The Good Garage Guide

Will you have to pay the low emissions charge?

Use our ULEZ checker to find out if your vehicle is subject to ULEZ charges. Simply enter your number plate into the Honest John ULEZ checker to see if you will have to pay to enter the London Ultra Low Emission Zone.

Check your vehicle