DTC P1197: Slow 1/2 O2S During Catalyst Monitor: Description

1/2 Heated Oxygen Sensor (HO2S) catalyst monitor is monitored with engine running, coolant temperature more than 170°F (76.7°C), open throttle, vehicle speed is steadily increased more than 18 MPH but less than 55 MPH, and light engine load exists for at least 5 minutes. DTC will set in Powertrain Control Module (PCM) memory if PCM senses 1/2 HO2S is switching from less than .39 volt to more than .6 volt fewer times than required. Possible causes for DTC to set are: oil or coolant consumption, defective 1/2 HO2S, defective connector or defective wiring.