P013E or P014A
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
The ECM determines the time for the HO2S 2 to transition from greater than 590 mV to less than 140 mV is greater than 4.8 seconds. The condition exists for greater than 4 seconds or for a cumulative time of 30 seconds.