Instructions
Insert a memory card into your PlayStation 2. Open the disc tray and insert the GameShark disc. Press reset on your console.
Scroll down to "Expert Cheat Mode" on the GameShark menu and hit "X."
Locate the entry for "Resident Evil 4" on the list of games. Select the entry and hit "X."
Press the "circle" button to open a submenu. Highlight "Add" and hit "X."
Enter a name for your new cheat and hit the "enter" button on the on-screen keyboard.
Scroll down the list of cheats and highlight your new cheat entry and hit the right arrow button. Hit the "circle" button on the blank code screen.
Use the on-screen keyboard to enter the unlimited life cheat. You must enter the code one line at a time. To do this, enter the first line of the code and hit the enter key on the on-screen keyboard. Re-select your new cheat code and hit "circle" and select "Add." Hit "L1" to scroll to the beginning of the code and type in the second line of the cheat code. Hit enter again to return to the cheat menu.
Repeat this process until you enter each line of the following code:
2800E87C 83565CF1
2800E868 A9F1F722
D85F35E8 0CA1083E
2800E86D 68F1F78A
D85F35E8 0CA5083E
2800E86D 6834F78A
Return to the list of games, choose "Resident Evil 4" again, and wait for the code to save. Choose your new code from the available cheats.
Enter the game disc when the disc tray opens. Your cheat is now activated and you can play the game with unlimited life.