I've seen some A4's that have their foglights on but not their headlights, is this some kind of mod?

 

it's right on the first page of the DIY section.

https://www.audiforums.com/forum/diy-do-yourself-55/diy-independent-foglight-mod-90540/

can't believe you've not come across it in the year plus you've been around.

 

My goodness, so am I. thanks though

 

Heh, that's the one I am going to try next. There's another one that involves tapping into a wire on the harness and tying it to the power posts under the dash. I used it for my 99 and it didn't work. Hiwords tried every wire on the harness for his fog button and it didn't work either. Maybe this will work better.

 

wont work for my 98.5 =[