The PlayStation 3 version of Fallout: New Vegas is apparently having problems with preorder DLC codes – they’re not working.
Obsidian's Fallout twitter issued a tweet stating:
For those trying to get the PS3 digital content codes to work, we’re working with Sony to resolve the issue. Should have an update soon.
The devs have tweeter they fixed the problem but some PS3 owners claim their codes still aren't working.