P0139

DTC P0139: Slow Response in Secondary HO2S (Sensor 2) Circuit

1. Turn the ignition switch ON (II).
2. Do the DTC CLEAR in the CLEAR MENU with the Honda PGM Tester or the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
4. Test-drive with the throttle fully opened, then slow down with the throttle completely closed for 3 seconds.
5. Monitor the OBD STATUS for DTC P0139 in the DTCs MENU with the Honda PGM Tester or the HDS.

Does the screen indicate FAILED?

YES - Go to step 6.

NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. 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).
8. Turn the ignition switch ON (II).
9. Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS.
10. Do the ECM/PCM idle learn procedure.
11. Test-drive with the throttle fully opened, then slow down with the throttle completely closed for 3 seconds.
12. Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS.

Are any Temporary DTCs or DTCs indicated?

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 troubleshooting.

NO - Go to step 13.

13. Monitor the OBD STATUS for DTC P0139 in the DTCs MENU with the Honda PGM Tester or the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete.

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.