P1197

Tests 1 - 2:

Tests 3 - 6:

SYMPTOM
P1197 - 1/2 O2 SENSOR SLOW DURING CATALYST MONITOR

WHEN MONITORED
With the engine running, coolant temperature > 170 °F, open throttle, steady to slightly increasing vehicle speed > 18 mph < 55 mph, with a light load on the engine for a period no less than five minutes.

SET CONDITION
The oxygen sensor signal voltage is switching from below 0.39 volt to above 0.6 volt and back fewer times than required.

POSSIBLE CAUSES
- 1/2 O2 sensor ground circuit open
- Engine fluid consumption
- 1/2 O2 sensor connector
- 1/2 O2 sensor
- Exhaust system leaking
- PCM connector