Conditions required to set DTC are:
- No ECT, IAT, MAF, MAP, or TP sensor DTCs set.
- No fuel trim, injector or HO2S 1 heater circuit DTCs set.
- No EGR or EVAP system DTCs set.
- Engine speed 1000-3000 RPM.
- Vehicle operating in closed loop mode.
- Listed conditions present during 100 second monitoring period.
- Ratio of average response times not 0.4-4.0.