Which side is bank 1?

[LaserSVT]

Just came back from Autozone and the reason for my check engine light is P0136 bank 1 sensor 2 mailfunction. I know it is my MIL eliminator, guess one is no good. So is bank 1 drivers or passengers side?

 

[cjones]

bank 1 on any car is the same side as the #1 cyl. so that would be passenger side of a mustang