joboo

when i turn on the headlights and the bottom fog lights the driver side rear fog light comes on? I am wondering if this suppose to happen? Are they suppose to be both on in the rear? or just the drivers side rear?

mbtech208

Just the driver's rear. Two rear foglights would look like brake lights to those following you.

steve s

yeah...that is correct. it is also like that on my volvo...kinda european thing. i think the reasoning was they didn't want drivers behind u to think u were riding ur brakes. altho in some states...i think u can have two rear fogs as long as they are wide apart near the edges (altho i think the a6 has them in the middle around the license plate...not sure), cause u still have the middle brake light that's not lit.

Dziner82

Bump...
This was super helpful. I thought one rear fog was burnt out, luckily I only tried replacing the bulb before I found this and not more things.

Twichel04

When you pull the knob to turn on your fogs, it will pull out two clicks. the first click turns on your front fogs only, the second will turn on your rear fog.

Dziner82

yes but the key is that there is only 1 rear fog light, the drivers side.
there is no passenger side rear fog light. (well there is a bulb but it doesn't get brighter like the driver side one does).'