Conditions For Setting DTC
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
PCM detects that the HO2S 1 rich-to-lean transition time takes longer than 105 milliseconds.
PCM detects that the HO2S 1 lean-to-rich transition time takes longer than 95 milliseconds.