When my fogs went out, it was the headlight stalk (multi-function switch) that needed replacement. Turn the headlights on along with the fog switch, take the stalk at the bottom and move slightly, left, right, back & forth. When I did this, I could get the fogs to flash quickly. Purchased the multi-function switch @ $70 and as I dind't want to bother with the installation, had it installed when getting new tires, I think I was charged $75.