Conditions for Running the DTC

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Before the ECM can report DTC P2626 or P2629 failed, DTCs P0101, P0121, P0122, P0123, P0221, P0222, P0223, P0336, and P0338 must run and pass.
The ignition voltage is between 11-18 volts.
The engine speed is greater than 25 RPM.
The ignition has cycled ON and OFF between 6-16 times dependent on coolant temperature.
The fuel system is in fuel shut-off for greater than 5 seconds.
The calculated exhaust temperature is less than 750°C (1,382°F).
The HO2S 1 is at operating temperature.
DTC P2626 and P2629 run continuously once the above conditions are met.