PO139 WTF - Honda-Tech
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Old 10-02-2010, 05:18 AM   #1
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Default PO139 WTF

anyways the CEL came on after a very grueling 16 hour work day In my 05 civic SE

checked it when i got home po139 meaning o2 sensor ckt #2 slow response.

What does this mean? is it just dirty? usually if it was gone it would say no activity, so im stumped.

Any input?
2007 Honda civic SI White 2dr 6 speed
2007 Honda civic Brown 4dr 5 speed
2011 Chevorlet Silverado Black Cheyenne Edition 4WD
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Old 10-02-2010, 05:46 AM   #2
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Default Re: PO139 WTF

1. Reset the ECM/PCM

2. Start the engine . Hold the engine at 3,000 rpm without load until the radiator fan comes on.

3. Check the secondary HO2S (sensor 2) output voltage with a scan tool.

Is there 0.3- 0.8 volts?

YES- Replace the secondary HO2S (sensor 2) and the third HO2S (sensor 3). They must be replaced together.

NO- Intermittent failure, check for lose connections at the secondary HO2S and at the ECM/PCM.
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