Conditions for Setting the DTC
WARNING: This page is about a different car, the 2004 Suzuki Swift + and 2004 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
The ECM detects that the HO2S 1 voltage is more than 550 mV for 11 seconds during Decel Fuel Cut-Off (DFCO) mode.