Conditions For Setting DTC

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

ECM detects no affected HO2S 1 sensor activity and the affected HO2S 1 voltage is 400-538 mV for more than 7 seconds.
ECM detects that both of the affected front and rear HO2S voltage signals remain greater than 200 mV during decel fuel cutoff for more than 3 seconds.
ECM detects the affected HO2S 1 calculated internal resistance is more than 20,000 ohms.