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 Post subject: Need Code Help
PostPosted: Mon Dec 27, 2010 2:01 pm 
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Joined: Wed May 21, 2008 10:49 pm
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Location: Slickville, PA
Year and Trim: 2001 SE
My car gives the code p0131 O2 sensor low volts (bank 1 sensor 1). I changed the O2 sensor thinking that's what it is. It still sets the code though. It only happens when I'm climbing a long hill, then the car loses almost all power and sometimes sets the SES light. Any ideas of what I should look at? Thanks in advance.

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 Post subject: Re: Need Code Help
PostPosted: Mon Dec 27, 2010 4:40 pm 
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Resident Gearhead
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Location: Hillsboro, Oregon
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Which sensor did you change? Before or after the catalytic converter.


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 Post subject: Re: Need Code Help
PostPosted: Tue Dec 28, 2010 6:21 pm 
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Location: Slickville, PA
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I changed the sensor before the cat.

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 Post subject: Re: Need Code Help
PostPosted: Tue Dec 28, 2010 8:06 pm 
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Resident Gearhead
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Location: Hillsboro, Oregon
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2013 Buick Regal GS
What brand sensor? Make sure the connector is connected and not corroded, wires are out of the way of the exhaust manifold. Also make sure the plug wires are not laying against it.

Do you have acess to a scan tool that you could monitor while driving?


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 Post subject: Re: Need Code Help
PostPosted: Wed Dec 29, 2010 12:51 am 
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Location: Slickville, PA
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The sensor brand is Standard. I bought it at A G auto parts. I made sure not to buy a Bosch. I don't have access to a scan tool. It's a strange problem because when it happens and I lose power it is gone until I reach the top of the hill. I can then accelerate with no problem. It almost feels like the cat is intermittently clogged.

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 Post subject: Re: Need Code Help
PostPosted: Thu Jan 06, 2011 7:02 pm 
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Location: Slickville, PA
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I was reading on the gm forum that this code can result from the engine running lean. I'm going to clean the MAF sensor and see if that helps. Does anyone know why a reason why it would only run lean when climbing a steep long hill?

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 Post subject: Re: Need Code Help
PostPosted: Thu Jan 06, 2011 9:15 pm 
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Location: Morris, Illinois
Year and Trim: 2000 SSEi, 3.4", FWI, Saner HD sway bars,137K
Poor fuel delivery would be my guess.


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 Post subject: Re: Need Code Help
PostPosted: Thu Jan 06, 2011 10:12 pm 
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How old is your fuel filter?

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 Post subject: Re: Need Code Help
PostPosted: Fri Jan 07, 2011 12:02 am 
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Location: Slickville, PA
Year and Trim: 2001 SE
The fuel filter was changed two days ago. I still have the problem though. I thought that changing the filter would fix the problem.

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 Post subject: Re: Need Code Help
PostPosted: Tue Feb 22, 2011 5:13 pm 
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It was a dirty MAF sensor. I cleaned it and haven't had the problem in over a month. Thanks for all your help tracking this problem down.

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