Hey!
Online Pass redemption codes should come free with every new EA game and are generally redeemed through either the Playstation Network Store or the Xbox Live Marketplace. However, if your bought a second hand copy of a game and the Online Pass was redeemed already, you need to get a new one. You can purchase one for $9.99 in the PSN Store or 800 Microsoft Points in the Xbox Live Marketplace.
Cheers
Basti
