Showing the bulb of the rear fog light on these S60 V70 XC70 XC90 P2 Volvos
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A Volvo owner mentioned these fog light may be related to having the headlights on - on my car I have the daytime running lights - low beam headlights and tail lights are always on. So if you don't have the daytime running lights, you may need to turn your headlights on first
