The following are known Action Replay Codes for NFL Blitz 2002 on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
d782661c
2311f39e
31bf2d81
220e6562

Team 1 Scores 200
035e2a25
0f071ed3

Team 1 Scores 0
6b70664a
708b0ad2

Team 2 Scores 200
b30a9795
d4080180

Team 2 Scores 0
9fdaa50f
ce521534

Team 1 Infinite Turbo
639d5394
8c881fe3

0:00 Left
ff76a821
4b959618

Always 1st Down
d4e79c9d
b79bf811

Always 4th Down
e44edda4
3a8a61e1

Press AR Button: Slow
dbba3a89
4cb74b94