 DTC DETECTION LOGIC
The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity of the three way catalyst 1 causes the longer switching time. To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the switching response of the sensor's voltage is faster than specified during various driving conditions such as fuelcut.  DTC No.
| Trouble diagnosis name
| DTC detecting condition
| Possible cause
| P0139
| Heated oxygen sensor 2 (bank 1) circuit slow response
| It takes more time for the sensor to respond between rich and lean than the specified time.
| - Harness or connectors
(The sensor circuit is open or shorted)
- Heated oxygen sensor 2
- Fuel pressure
- Fuel injector
- Intake air leaks
| P0159
| Heated oxygen sensor 2 (bank 2) circuit slow response
|
 DTC CONFIRMATION PROCEDURE
 1.INSPECTION START
Do you have CONSULT-III? Do you have CONSULT-III? YES >>GO TO 2. NO >>GO TO 5.
 2.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.
 3.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
- Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
- 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).If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches 70°C (158°F).
- Open engine hood.
- Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-III.
- Start engine and follow the instruction of CONSULT-III display.
NOTE: It will take at most 10 minutes until “COMPLETED” is displayed.
- Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT-III screen?
OK >>INSPECTION END NG >>Go to Diagnosis Procedure (GT-R certified NISSAN dealer). CAN NOT BE DIAGNOSED >>GO TO 4.
 4.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.
 5.PERFORM COMPONENT FUNCTION CHECK
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