o2 oxygen sensor obd

My 2006 RTL had the engine check light come on at 51K miles and threw 3 OBD II codes: P0137, P0138, and P2270 - which indicate a faulty O2 sensor: Bank 1, Sensor 2. Is the location of that sensor after the catalytic converter coming off the manifold in the back of the engine? If so, it looks...