primary o2 issues

alright so i figured out that you gotta get the k-pro in order to eliminate the check engine for the secondary o2....the next problem is that i don't have the primary o2 either....i have an o2 from the 2004 si....it plugs right in no problem and everything...so if i get the k-pro/aem will i be able to bypass the stock k-series primary o2 with the 2004 si o2....lemme know asap thank you