First remove the driver's side fog lamp plastic cover out from front bumper. After that you will find torx socket head panel screws from fog lamp. See picture below:
That's the rear foglight socket. The rear foglight idea is European, and they ship the Audi over with a rear foglight as well, but it's only on the driver's side (that's the way rear fogs are done in Europe). That socket is fully powered though, and wired to the same dash switch as the driver's side rear fog. What you can do (what I did on my 99 A4) was to use a drill and **** out the rectangular opening in the rear taillight panel, and then put a bulb in that socket. Voila, instant dual rear fogs.
This is a good idea because in Europe, the police understand that a rear fog is only on one side. In the US, our police don't always know that, and you may get pulled over if you have that on - they may think you have a blown taillight bulb. Do the dual fog mod as described above - it'll save you the hassle and it looks better too.
Yes it's true. What I did on my US-spec A4 is to pull back the trunk lining on the passenger (right) side, where there is no functional foglight (my rear fog from the factory is on the left side). What I found was that the "bulb tree" has a fully powered socket for a bulb that would fit into a rear foglight on that side, but no bulb was installed. The part of the taillamp that would have a hole for such a fog bulb had a **** instead. I used a drill to widen the **** into a hole large enough for a bulb, and installed a bulb in the bulb tree, and voila - dual rear fogs:)
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