Check engine light code P0139pd

REDHILLBOB

MEMBER
2005 HONDA ACCORD
2.4L
4 CYL
2WD
AUTOMATIC
206,000 MILES

A few months ago I changed both upstream/downstream 02oxygen sensors with original Denso sensors in my car, but then last night the check engine light came back on again with P0139pd where as before it was just P0139. Does the P0139pd have a different meaning then just P0139?

Thanks!

4 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning.

139 flow chart is below. You will need a high end scan tool to follow the flow chart for the failure. Yes, they are the same.

Roy

DTC P0139: Secondary HO2S (Sensor 2) Slow Response (2005 model)

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:
- Engine coolant temperature more than 176 °F (80 °C)
- A/T in D position (M/T in 4th gear)
- Vehicle speed between 35 mph (56 km/h) and 55 mph (88 km/h)
- Drive 5 minutes or more

5. Monitor the OBD STATUS for DTC P0139 in the DTCs MENU with 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. Check for poor connections or loose terminals at the secondary (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).
8. Turn the ignition switch ON (II).
9. Reset the ECM/PCM with the HDS.
10. Do the ECM/PCM idle learn procedure. See: Engine Control Module > Programming and Relearning
11. 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.
12. Test-drive under these conditions:
- Engine coolant temperature more than 176 °F (80 °C)
- A/T in D position (M/T in 4th gear)
- Vehicle speed between 35 mph (56 km/h) and 55 mph (88 km/h)
- Drive 5 minutes or more

13. Check for Temporary DTCs or DTCs with 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's troubleshooting.

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?

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.