Scott, do you know of a fix for this? Any way i can check relays? Locations? Coz this is really stumped me as to why its drawing power while the car is off...when its unplugged i get the warning about no bulbs on that quarter but when its plugged in warnings go away but just stays on...i am waiting for vcds to come in the post so ill see what that tells me and post on here. Should i just buy another headlight unit and try that?

Part Numbers?
 

https://cimg0.ibsrv.net/gimg/www.aud...2a2d3e6a96.jpg
https://cimg1.ibsrv.net/gimg/www.aud...8ce64273e7.jpg
OK, there are several flavors of headlamp depending on features. What are the P/Ns of yours. Should be on labels top corner fender side:

Hi scott im afraid this is all i have...16 year old headlight label...i hooe you can make somethin out from the sticker.
https://cimg5.ibsrv.net/gimg/www.aud...51e507a656.jpg
FO 941 003 N?
EO 941 003 N?

EVERYTHING ELSE HAS PERISHED APART FROM THIS ONE STICKER UNFORTUNATELY.

Thank you for trying to help me.

Just to clarify, my car is up on axle stands would this cause her to keep a light on?

Ok jusr done a VIN check on my a8 and it says shes a 2004 on an 03 plate...and lookin at some headlight i believe my ones are the ones that have no ballast no burners and no dRLs? Just the bog standard ones if theres such a thing...i am hopeless at this issue....having the patients of a saint to replace the two post cat lambdas on the other hand...there done tbh haha the pre cat ones i cannot find...haha

Yeah, I can't tell what headlight model you have from that label. Perhaps the other one is in better shape? I don't want to speculate what your problem could be without knowing what type of headlight you have. You could probably get the whole light assembly off eBay for less than $300, but you would have to have the correct p/n!

Hey scott, i believe the part number is 4EO 941 003 N

OK, this clears up a lot. You're in the UK, Land of Right Hand Drive and you have a very early D3 A8 with, as you said, bog standard halogen headlamps. Unfortunately, I've never seen such a configuration config over here, so I'm not gonna be much help. Perhaps this will - you can get a second hand part cheap as chips, if you want to try swapping: