Rear fog light(s)

[Eric Harman <ericha@wrq.com>]

I've got a '91 200 Quattro 20v sedan and I think the right rear fog light 
is out.  I say think, because I read the posts recently about left-side 
only fog lights on other models.  The reason I'm not sure is that the 
owner's manual for the car talks about fog lightS.  Also, there is wiring 
on both sides of the car.  Of course, from what I can see the car uses a 
two filament bulb, one for regular rear parking lights and the second 
filament for the fogs.  
Anyway, I found that I had left side only, so I swapped the bulbs as a 
Level 1 diagnostic and found that I then had a right rear fog light ALL the 
time and a left rear fog light none of the time.  

I think this means: your original right rear fog light bulb had the high 
filament burned out and your right side fog light is shorted on.  

Questions?  Comments?  

    -Eric (ericha@wrq.com)