You should have classified the questions a bit differently. Injector issues should not concern the 200 CDI engine but the 220 CDI and the 250 CDI engines only.
I see from the poll that some claim they have had problems with their V6 engines, would have been nice to see those explained, or are they from some BMW owners who do not want to become identified? I guess we talk about the CDI, not the CGI. I've never heard of premature issues on the V6. I guess some of these are approaching such high mileage that wear issues can appear.