Condition 1 and 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 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 engine is operating.
- The ignition voltage is greater than 10 volts.
- The HO2S 1 heater duty cycle is greater than 70 percent for greater than 8 seconds, 90 percent for greater than 5 seconds for LLT.
- The DTCs run continuously once the conditions above exist for greater than 20 seconds, 60 seconds for LLT.