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  #1  
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.
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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.

Click the image to open in full size.

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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