Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The engine is operating for more than 85 seconds.
The HO2S heater is commanded ON.
The HO2S signal voltage is between 0.3-1.5 volt.
DTC P2245 and P2249 run continuously once the above conditions have been met.