W203 Bi-xenon headlights problem

Hello, everyone. I've got W203 C270 CDI, 2001y Mercedes Benz. I cannot pass technical inspection, because there some issues with my Bi-xenon headlights. I've bought new D2S bulbs, but not very expensive ones, at the technical inspection shows that there is almost no lights, they say headlights are dead... How can i solve this problem? On both headlights is the same problem... I have noticed that headlights looks foggy, I am planning to polish them. It would help a bit or not?
I am attaching my headlights pic. Thank you for your time!