Conditions for Running the DTC

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.

DTC P0201, P0202, P0203, P0204, P0205, P0206 P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, or P0277 is not set.
The ignition voltage is greater than 10 volts.
The engine speed is greater than 25 RPM.
The HO2S 1 heater command is greater then 70 percent for greater than 8 seconds.
The ECM is not commanding the air/fuel mixture rich.
DTC P0132 and P0152 run continuously when the conditions above exist for greater than 5 seconds.