battlefield 2142 no cd key..?

You can download, install and play Battlefield 2142 from your games library. Log into the Origin client with your Origin account, if the client is not installed yet you can download it from http://www.origin.com/download and then click My Games in the top left, this will open your games library. Battlefield 2142 should be listed there. If you are looking for the product code, right-click the game tile and select Show Game Details. If the product code is not shown there (this might happen if it was purchased recently), hit the refresh icon in the top left corner or select Reload my Games from the main menu.