Conditions for Setting the DTC

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. 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 100 seconds.
The DTCs set within 100 seconds when the above conditions are met.

P0140 or P0160

The ECM detects that the HO2S 2 voltage is between 410-490 mV.
The throttle position has changed greater than 5 percent at least 6 times during the test.
The DTCs set within 100 seconds when the above conditions are met.