Conditions for Setting the DTC (w/LLT)
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The ECM detects that the rear HO2S voltage is less than 650 mV for greater than 100 seconds, then an intrusive test is performed. The ECM will enrich the fuel mixture up to 30 percent and then wait for 10 seconds at 30 percent. The ECM detects that the HO2S voltage is less than 650 mV during the intrusive test for greater than 4 seconds or for a cumulative of 50 seconds, the DTC sets.