P0030 & p0135 - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

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post #1 of 20 (permalink) Old 07-07-2013, 10:05 AM Thread Starter
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I just got these CEL codes and was told its a bad o2 sensor in my header. Is this the problem and how do I replace it? What tools are necessary?


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post #2 of 20 (permalink) Old 07-07-2013, 10:23 AM
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Check connections first for broken wire.
You just need a wrench or an O2 socket.


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post #3 of 20 (permalink) Old 07-07-2013, 10:30 AM Thread Starter
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What size o2 socket?


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post #4 of 20 (permalink) Old 07-07-2013, 10:37 AM
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Only one size for O2 sensors and that's the one shown. I believe it's 7/8"

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post #5 of 20 (permalink) Old 07-07-2013, 10:48 AM Thread Starter
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Ok and this sensor is located in my header correct? Making it upstream?


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---------- Post added at 01:48 PM ---------- Previous post was at 01:41 PM ----------

Could this also be a bad fuse? If so which one?


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post #6 of 20 (permalink) Old 07-07-2013, 10:55 AM
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Bank 1 Sensor 1 is prior to CAT.

Bad fuse would show codes for both HO2's.

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post #7 of 20 (permalink) Old 07-07-2013, 10:56 AM Thread Starter
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Okay so it is the one in my header. Cool, thanks, you're the man

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post #8 of 20 (permalink) Old 07-07-2013, 06:21 PM Thread Starter
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$16 for the sensor and $6 for the socket. Not too bad.


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post #9 of 20 (permalink) Old 07-07-2013, 08:28 PM
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Where did you get an OEM or ACDelco HO2 sensor for $16?

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post #10 of 20 (permalink) Old 07-07-2013, 09:54 PM Thread Starter
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