Conditions for Setting the DTC

The ECM detects that the HO2S 1 rich-to-lean average response time is less than 90 milliseconds or lean-to-rich average response time is more than 125 milliseconds.

Or

The ECM detects that the HO2S 1 rich-to-lean or lean-to-rich switches are less than 10.

Or

The ECM detects that the HO2S 1 signal spends twice the amount of time in the rich region as compared to the lean region or the HO2S 1 signal spends twice the amount of time in the lean region as compared to the rich region.