service engine soon light

hello everyone,I'm new here very intresting site looks like I could learn a lot of info about my vehicles here. Let me start i have a 2001 suburban that doesn't have 40,000 miles on it yet and i'm getting a ses light.The code being read from code reader is P1153.Is there any one who could possibly help me find out what this is and what I need to do to get this light to turn off.
any help would be very apperciated
thanks new member
sub2001

Insufficient switching bank 2 sensor 1. May need a new oxygen sensor

first note is number 2 bank the passengers side of the engine,and sensor 1 is that the one close to the manifold,or the one after the catalytic converter.
thanks
Sub2001

Passenger side, before the converter.