Condition 2

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0116, P0117, P0118, P0119, P0201, P0202, P0203, P0204, P0205, P0206 P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.
The ignition voltage is greater than 10 volts.
The engine is operating for greater than 1 second.
The engine coolant temperature (ECT) during the previous ignition cycle was greater than 60°C (140°F).
The ECT at startup is less than 40°C (104°F).
The HO2S 1 heater duty cycle is greater than 90 percent for greater than 5 seconds.
DTC P0131 and P0151 run continuously once the conditions above exist.