Conditions for Setting the DTCs

If the ECM detects that the rear HO2S 2 voltage is greater than 650 mV for greater than 20 seconds, then an intrusive test is performed. The ECM will lean the fuel mixture up to -7 percent and then wait for 10 seconds at -7 percent. If the ECM detects that the HO2S 2 voltage is still greater than 650 mV, the ECM then tests the HO2S 2 at the next decel fuel cut-off. If the ECM detects the HO2S 2 voltage is greater than 140 mV after 4 seconds in decel fuel cut-off, this DTC sets.