[will-w]

I seriously doubt that something as simple as the fog light is controlled by the ECU in any way, after all it's a simple electric circuit...

Is there actually a space for another fog light on that side? If so, have you tried following the cabling and making sure that it's connected?

You could (as a quick fix to pass the test) route the wiring for the existing fog to a new separate fog light stuck to the bottom of the bumper?

I had to do this on my Jap import Prelude as they don't have to have rear fogs in Japan, so it didn't have one at all!