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HOMESERVICE MANUALSHONDA2006ELEMENT EX, 2.4 YH1, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISPGM-FI SYSTEMDTC TROUBLESHOOTINGDTC P0139: SECONDARY HO2S (SENSOR 2) SLOW RESPONSE (2005-2006 MODELS)
2006 Honda Element EX, 2.4 YH1, Standard

DTC P0139: Secondary HO2S (Sensor 2) Slow Response (2005-2006 models)

2006 Honda Element EX, 2.4 YH1, StandardSECTION DTC P0139: Secondary HO2S (Sensor 2) Slow Response (2005-2006 models)
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Test-drive under these conditions:
    • ECT SENSOR above 176°F (80°C)
    • A/T in D position (M/T in 5th gear)
    • Vehicle speed at 35 mph (56 km/h) or more
    • Drive about 12 seconds
  5. Monitor the OBD STATUS for DTC P0139 in the DTCs MENU with the HDS.

    Does the screen indicate FAILED? 

    1. YES-  Go to step  6.
    2. NO-  If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step  3 and recheck.
  6. Turn the ignition switch OFF.
  7. Replace the secondary HO2S (Sensor 2) (see A/F SENSOR REPLACEMENT ).
  8. Turn the ignition switch ON (II).
  9. Reset the ECM/PCM with the HDS.
  10. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  11. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  12. Test-drive under these conditions:
    • ECT SENSOR above 176°F (80°C)
    • A/T in D position (M/T in 5th gear)
    • Vehicle speed at 35 mph (56 km/h) or more
    • Drive about 12 seconds
  13. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES-  If DTC P0139 is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step  1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
    2. NO-  Go to step  14.
  14. Monitor the OBD STATUS for DTC P0139 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    1. YES-  Troubleshooting is complete.
    2. NO-  If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM/PCM, then go to step  1. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step  11 and recheck.
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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.