DTC P1196: 2/1 O2 Sensor Slow During Catalyst Monitor: Description

2/1 Heated Oxygen Sensor (HO2S) catalyst monitor is monitored with engine running, coolant temperature more than 170°F (76.7°C), open throttle, vehicle speed steady or slightly increasing between 18 and 55 MPH and engine under light load for at least 5 minutes. DTC will set in Powertrain Control Module (PCM) memory when PCM senses 2/1 HO2S is switching from less than .39 volt to more than .6 volt fewer times than required. Possible causes are: exhaust leak, high resistance in 2/1 HO2S signal circuit, high resistance in 2/1 HO2S ground circuit or defective 2/1 HO2S.