Conditions for Running the DTCs (w/LLT)

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 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.
The HO2S 1 heater duty cycle is greater than 90 percent for more than 5 seconds.
OR
The HO2S 1 heater duty cycle is greater than 68 percent and the calculated exhaust temperature is greater than 600°C (1112°F) for more than 30 seconds.
DTCs P0134 and P0154 run continuously once the conditions above exist for greater than 10 seconds.