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Home >> Nissan-Datsun >> 2004 >> Sentra Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - QG18DE >> DTC P0139: Ho2S2 >> DTC Confirmation Procedure
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DTC Confirmation Procedure

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

With CONSULT-II 

For the best results, perform " DTC WORK SUPPORT  " at a temperature of 0 to 30°C (32 to 86°F) 

  1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
  2. Start engine and warm it up to the normal operating temperature.
  3. Turn ignition switch OFF and wait at least 10 seconds.
  4. Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for at least 1 minute under no load.
  5. Let engine idle for 1 minute.
  6. Make sure that "COOLANTEMP/S" indications more than 70°C (158°F).

    If not, warm up engine and go to next step when "COOLANTEMP/S" indication reaches to 70°C (158°F).

  7. Select "HO2S2 (B1) P0139" of "HO2S2" in "DTC WORK SUPPORT" mode with CONSULT-II.
  8. Start engine and following the instruction of CONSULT-II.
    Fig 1: CONSULT-II Display Data Monitor
    G00772713Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 2: CONSULT-II Display DTC Work Support
    G00772714Courtesy of NISSAN MOTOR CO., U.S.A.
  9. Make sure that OK is displayed after touching "SELF-DIAG RESULTS".

    If NG is displayed, refer to DIAGNOSTIC PROCEDURE .

    If "CAN NOT BE DIAGNOSED" is displayed, perform the following.

    1. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
    2. Return to step  1.