Looking through the X3 threads, this has not been discussed. The service advisor told me that there is a Service Bulletin, in regards to this and installed the drop in filter. The thought process in my mind is to simply install software that would raise the air/fuel ratio. This just seems odd that it would throw a code for this. The computer should have adjusted and fixed the problem, but alas it did not.

To further this, they did vacuum leak checks and fuel leak checks and did not turn up anything.