P0138

DTC P0138: O2S Circuit High Voltage (Sensor 2)

Wiring Diagram:

DTC Detecting Condition And Trouble Area:

DTC Confirmation Procedure

WARNING:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
- Road test should be carried out with 2 persons, a driver and a tester, on a level road.

NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION PROCEDURE.
- Intake air temperature: -8 °C (18 °F) or higher
- Engine coolant temperature: -8 - 110 °C (18 - 230 °F)
- Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)

1. Connect scan tool with ignition switch OFF.
2. Turn ON ignition switch and clear DTC, pending DTC and freeze frame data in ECM memory by using scan tool and start engine.
3. Increase vehicle speed to 55 km/h (40 mph) or more.
4. Keep driving above vehicle speed till engine is warmed up completely (Change of vehicle speed is permitted in this step).
5. Keep driving 50 - 60 km/h (30 - 40 mph) for 8 min. or more.
6. Increase vehicle speed to 100 - 110 km/h (60 - 70 mph).
7. Release accelerator pedal and with engine brake applied, keep vehicle coasting and then stop vehicle.
8. Check if DTC and pending DTC exists by using scan tool. If not, check if oxygen sensor monitoring test has completed by using scan tool. If not in both of above checks (i.e., no pending DTC and oxygen sensor monitoring test not completed), check vehicle conditions (environmental) and repeat Steps 3 through 7.

Step 1 - 2:

Step 3 - 4:

DTC Troubleshooting