DTC Set Criteria

Engine coolant temperature is more than 176°F (50°C). Engine speed is 1250-3000 RPM. Volumetric efficiency is 20-60 percent. Intake air temperature is more than 14°F (-10°C). Barometric pressure is more than 11 psi (76 kPa). Engine is under closed loop air/fuel control and not in idle state. Code will set when left front HO2S sends alternating lean and rich signals 10 times or less in 12 seconds. Monitor runs once per drive cycle.