So why the error?
If you do not want to create a new memory card, you can delete specific data from inside the game itself. This is a useful feature within Tekken 5 often overlooked. tekken 5 pcsx2 memory card full
The best long-term solution is to convert your standard 8MB card into a folder-type card. This allows the card to expand as needed, effectively removing the storage limit. So why the error
Tekken 5 has an enormous memory footprint for a PS2 game. tekken 5 pcsx2 memory card full