Heated Oxygen Sensors Monitor Drive Cycle

HEATED OXYGEN SENSORS MONITOR DRIVE CYCLE

Upstream (Universal) oxygen sensors:
1. Engine OFF; cooling fans inoperative > 20 seconds.
2. Start engine and bring to normal operating temperature > 82 degree C (180 degree F).
3. Drive the vehicle between 3000 - 4000 rpm in 3rd gear at a steady speed. Lift foot completely off accelerator and coast to a stop within 30 seconds. Do not touch accelerator pedal for 4 seconds after coming to a stop.
4. Repeat step 3.
5. Idle engine for 11 minutes.

Downstream oxygen sensors:
1. Start engine and bring to normal operating temperature > 82 degree C (180 degree 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 degree C (180 degree F).
2. Idle engine for 3 minutes.