Conditions for Setting the DTC

The ECM detects that the HO2S 1 rich-to-lean average response time is less than 100 milliseconds for an automatic transmission and 85 milliseconds for a manual transmission or lean-to-rich average response time is more than 125 milliseconds for an automatic transmission and 100 milliseconds for a manual transmission.
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.