Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC Confirmation Procedure
- INSPECTION START
Do you have CONSULT?
Do you have CONSULT?
YES: GO TO 2.
NO: GO TO 7.
- PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
For better results, perform "DTC WORK SUPPORT" at a temperature of 0 to 30°C (32 to 86°F) .
GO TO 3.
- PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
- Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT.
- Start engine and warm it up to the normal operating temperature.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
- Start engine and keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
- Let engine idle for 1 minute.
- Make sure that "COOLAN TEMP/S" indicates more than 70°C (158°F).
- Drive the vehicle at a speed of 60 km/h (38 MPH) on the suitable gear position and keep the speed.CAUTION: Always drive vehicle at a safe speed.
- Release the accelerator pedal fully at least 5 seconds.CAUTION:
- Make it the condition that engine brake operates.
- Always drive vehicle safely.
- Never apply brake when releasing the accelerator pedal.
- Repeat step 9 and 10 at least 8 times.
- Check the following item of "DATA MONITOR".
DTC Data monitor item Status P0139 HO2 S2 DIAG1 (B1) CMPLT HO2 S2 DIAG2 (B1) P0159 HO2 S2 DIAG1 (B2) HO2 S2 DIAG2 (B2) Is "CMPLT" displayed on CONSULT screen?
YES: GO TO 6.
NO-1: "CMPLT" are not displayed on DIAG 1>>Perform DTC confirmation procedure again.
NO-2: "CMPLT" are not displayed on DIAG 2>>GO TO 4.
- PERFORM DTC WORK SUPPORT
- Open engine hood.
- Select "HO2S2 (B1) P0139" or "HO2S2 (B2) P0159" of "HO2S2" in "DTC WORK SUPPORT" mode with CONSULT.
- Start engine and follow the instruction of CONSULT display.
NOTE: It will take at most 10 minutes until "COMPLETED" is displayed.Is "COMPLETED" displayed on CONSULT screen?
YES: GO TO 6.
NO: GO TO 5.
- PERFORM DTC CONFIRMATION PROCEDURE AGAIN
- Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
- Perform DTC confirmation procedure again.
GO TO 3.
- PERFORM SELF-DIAGNOSIS
With CONSULT
Perform ECM self-diagnosis.
Is DTC "P0139" or "P0159" detected?
YES: Proceed to "DIAGNOSIS PROCEDURE ".
NO: INSPECTION END
- PERFORM OVERALL FUNCTION CHECK
Perform overall function check. Refer to "OVERALL FUNCTION CHECK ".
NOTE: Use overall function check to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st trip DTC might not be confirmed.Is the inspection result normal?
YES: INSPECTION END
NO: Proceed to "DIAGNOSIS PROCEDURE ".
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.