P0139 bank 1 sensor 2 - Honda Accord Forum - Honda Accord Enthusiast Forums


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Old 01-12-2010, 09:30 AM
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Default P0139 bank 1 sensor 2

Light came on, had it checked at AutoZone and this is the code they read out, but they did not know which sensor it was and if it was a sensor problem at all... Can anyone give some input before I start buying sensors? Thank you for your time.
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Old 01-12-2010, 10:09 AM
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What car? Gotta be a 1996 or newer? 4-cyl? V-6?

That's the rear sensor (in the cat). Maybe some V-6 Accords have 2 of those so??? It's specifically for sluggish response which most likely IS a bad sensor. Bad wiring is more likely to throw P0137 or P0138.

This belongs in General Tech, so I'll move it.

Last edited by JimBlake; 01-12-2010 at 10:13 AM.
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Old 01-13-2010, 12:34 PM
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Thanks for a quick reply.

It is 2005 Accord, 4 cyl. I've had two read-outs, both gave the same code (P0139), but each store tried to sell me a different thing, one said that it was a mass air flow sensor and another one told me it was )2 sensor, but he did not know which one it was.

I would appreciate further insight from someone who is not motivated to sell things.

Last edited by vitalithestudent; 01-13-2010 at 01:03 PM.
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Old 01-13-2010, 02:21 PM
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P0139 = secondary O2 sensor sluggish response

For your car (now that I know what year) that sensor is in the cat. Sensor is #31 in the picture. It's screwed into the side of the cat #2. The drawing shows a sensor #17 in the right position, but #17 is for a different year car. Your #31 sensor has a wire that goes thru the floor before you can unplug it. So you'll be rooting around under the carpeting, under the passenger front seat.



The front sensor is shown as #16, you don't want that one.
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Old 01-14-2010, 02:42 PM
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Thank you very much for the detailed answer and diagram, this will definitely help me in knowing where and what to look for.
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05, 1996, 2005, 2006, 2010, accord, bank, bank1, code, honda, location, o2, p0139, sensor, sensor2

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