Conditions for Setting the DTC
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
P0134 or P0154
The ECM detects that the HO2S 1 voltage is between 350-550 mV for at least 50 s.
P0140 or P0160
The ECM detects that the HO2S 2 voltage is between 410-490 mV for at least 74 s.