Non-EVAP-Leak-Check Model

DTC P0137 / P0138: O2 Sensor (HO2S) Circuit Low Voltage / High Voltage (Sensor-2, Bank-1) (Non-EVAP-Leak-Check Model)

Wiring Diagram

Wiring Diagram:

DTC Detecting Condition and Trouble Area

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 by 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 at engine start: -10 °C (14 °F) to 80 °C (176 °F)
^ Intake air temperature: -10 °C (14 °F) to 70 °C (158 °F)
^ Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
^ The following DTCs are not detected: DTCs related to MAF sensor, ECT sensor, IAT sensor, barometric pressure sensor, HO2S heater and VSS

1. With ignition switch turned OFF, connect scan tool.
2. Turn ON ignition switch and clear DTC using scan tool.
3. Start engine and warm up to normal operating temperature.
4. Increase vehicle speed to 60 - 80 km/h (37 - 50 mile/h) at 5th gear or D range.
5. Release accelerator pedal and with engine brake applied, keep vehicle coasting (with fuel cut for 12 sec. or more), then stop vehicle and run engine at idle speed for 60 sec. or more.
6. Repeat Step 4).
7. Keep above vehicle speed for 8 min. or more. (Throttle valve opening is kept constant in this step.)
8. Repeat Step 5).
9. Check DTC and pending DTC.

DTC Troubleshooting

Step 1-3:

Step 4-8: