Oxygen Sensor Monitor

Upstream (Universal) oxygen sensors:

1. Engine OFF; cooling fans inoperative > 20 seconds.
2. Start engine, coolant< 60°C (140 °F), and bring to normal operating temperature > 82 °C (180 °F).
3. Drive vehicle > 1500 rpm for 5 minutes
4. Bring vehicle to stop and idle for > 60 seconds

Downstream oxygen sensors:

1. Start engine and bring to normal operating temperature > 82 °C (180 °F).
2. Drive the vehicle steadily between 48 - 97 km/h (30 - 60 mph) for 10 minutes.
3. Drive the vehicle above 3000 rpm in 3rd gear at a steady speed. Lift foot completely off accelerator and coast for 30 seconds.

Oxygen sensor heaters:

1. Start engine and bring to normal operating temperature > 82 °C (180 °F).
2. Idle engine for 3 minutes.