Condition 1
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 detects that the HO2S 1 signal voltage increases greater than 2 volts in 4 out of 6 HO2S heater switch OFF samples.