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Check Engine Light: O2 Sensor

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Old Mar 23, 2012
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Check Engine Light: O2 Sensor
Car: 1998 Civic EX
190,000 miles
2nd owner

I have the codes PO137, PO138, PO139, and PO325 when i went to Autozone and got it checked. Previously I only had the 02 sensor problem and now they said I have the Knock sensor problem... Where should I begin?
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Old Mar 26, 2012
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Re: Check Engine Light: O2 Sensor
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Old Mar 27, 2012
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Re: Check Engine Light: O2 Sensor
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Old Apr 4, 2012
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Re: Check Engine Light: O2 Sensor
Any1?
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Old Apr 17, 2012
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Re: Check Engine Light: O2 Sensor
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Any1?


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Old Jun 4, 2012
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Re: Check Engine Light: O2 Sensor
...well I'd replace the O2 sensor first if you have that code, should be an easy fix
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Old Jun 4, 2012
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Re: Check Engine Light: O2 Sensor
Make sure which O2 sensor you need? upstream or downstream.




Originally Posted by Nardis
...well I'd replace the O2 sensor first if you have that code, should be an easy fix
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