I've been having this problem for some time and would like to get some help on where to look next.

It all started with intermittent "tail light" and/or "brake light" not working warnings on my 2001 X5 4.4. But, since they all work fine I've ignored it till now. But, now, I get constant "fog light" warning but they work fine.

I've checked the bulbs, all contacts for corrosions, and the fog light assy but don't see any reasons why I should be getting such a warning.

I assume it's related to some sort of sensing module hidden somewhere. Has anyone had a similar problem and was able to fix it? If so, I would really like to hear about it.

Thanks!
Yoshi