thanks Xaque, i may start with going through the wheel well first.Do you need to replace the housing or just the bulb?
If it's just the bulb then the procedure is outlined in the owner's manual. It requires removing the front wheel on the respective side and the plastic inside the wheel-well to gain access to the back of the fog light.
If you need to replace the whole fog light housing, then yes, the front bumper needs to be removed. However, there are no sensors you need to worry about. Just approximately 3 dozen fasteners around the bumper and along the underside. Then the whole bumper comes off and you can unbolt the fog lights.
(That said, that is the "official" method for changing out the fog light housing, it may very well be possible to do it through the wheel well, but I haven't tried.)