car is '01 S4. Is this an option in the US? The dash button is there, but appears to do nothing. Maybe there is an aftermarket kit? Also, anyone notice there are three bulbs/housings in the driver's side taillight assembly and four on the passenger side? What gives? Only three on the passenger look useable, the fourth looks like it has been made for a very small or oddly shaped bulb.

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US cars have the rear fog light included as standard equip. If you push the button, and the indicator on the button doesn't light up, it's probably a bag relay (buried in the dash behind the glovebox) or a blown fuse.

Also, I think there should be 4 bulbs on the driver's side housing (turn, stop, reverse, and fog). The passenger's side should have 3 (turn, stop, reverse). The 4th opening in the passenger side isn't for a bulb. They put that cutout there, but it serves no purpose.