online pass is removed but buy't my game 2e hand

The Xbox Live marketplace is currently experiencing some issues and this might impact your ability to locate or download the online pass app. 

Head to the official Xbox Live support website for more details: http://support.xbox.com/xbox-live-status

Once the marketplace is fully back up and running please try again searching for the online pass for Battlefield 3. Check the in-game store, the Xbox Live market place directly, or select Multiplayer and it should (in theory) prompt you to either input a code or purchase it directly. This purchase should be free of charge.