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Cel - P0138

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Old 12-12-2009, 02:32 PM   #1
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Question Cel - P0138

I understand that the code is an " o2 Circuit High Voltage, Bank 1 Sensor 2 "

Ive been trying to search around for how to fix this but no go on that end.

So, how would I go off to solve this? The o2 itself is relatively new. Its universal so I made sure I connected the wires properly to the oem wires which ends to the female plug.

Also, for some odd reason this CEL code ALWAYS comes on when the weather is moist [ I find that super odd ]. I for sure think there couldnt be any type of moisture leaking in the wires where they were connected [ used heat shrink tubes ] and also, if the CEL would to come on after ive reset or clear the code, it would randomly come back on at 60mph. It hesitates for a bit at 60mph then a few seconds later the CEL would come on.So now im stumped.


Side notes just in case : Engine : y7 but is using a y8 header and y8 cat not sure if that would help but its something.

- Thanks in advance
Sammo.
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Old 12-13-2009, 03:16 AM   #2
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Before sleep bump.
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I know most people will be like WTF-R, but after that many episodes of bangbus my fingers can bend raw titanium.
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Old 12-13-2009, 10:01 AM   #3
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Did you replace the primary O2 sensor due to code P0138 and the code persisted after replacement? Or did P0138 only show up after replacing the sensor?
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Old 12-14-2009, 04:28 AM   #4
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P0138 only started showing up after I replaced it.
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Old 12-14-2009, 09:38 AM   #5
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There's likely a problem with the quality of your cut and splice rewiring job.
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Old 12-14-2009, 09:12 PM   #6
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Thank you sir. I'll recheck my splicing and the rest of the wires.

Oh btw would it matter on the quality of the wire in which I used to extend them?
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Old 12-15-2009, 12:41 AM   #7
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Quote:
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There's likely a problem with the quality of your cut and splice rewiring job.
ok i have the same problem, but im pretty sure i did a good job on my rewiring job as i saudered and shrink tubbed them, could i have messed it up somehow?
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Old 12-15-2009, 01:40 AM   #8
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Quote:
Originally Posted by ohsnapzitzmeng View Post
ok i have the same problem, but im pretty sure i did a good job on my rewiring job as i saudered and shrink tubbed them, could i have messed it up somehow?
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Thank you sir. I'll recheck my splicing and the rest of the wires.

Oh btw would it matter on the quality of the wire in which I used to extend them?
Just for clarification, you both know that P0138 indicates a problem with the secondary O2 sensor circuit not the primary O2 sensor circuit, right?
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Old 12-15-2009, 05:07 PM   #9
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Yes sir. I do know that.

I gues I can redo the wiring job and see how it goes from there.

Thanks for the help and suggestion RonJ...U the man!
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Old 12-15-2009, 05:18 PM   #10
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This service manual diagram may or may not be helpful to you:

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Old 12-15-2009, 05:22 PM   #11
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Haha. with wiring diagrams. I panic and i start seeing blah blah blah blah on the paper. LOL i swear it took me 2 hrs to just wire my deck O_O and its just plug and play LOL

I'll give that diagram a shot though. Thanks again RonJ
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Old 12-15-2009, 05:25 PM   #12
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Quote:
Originally Posted by CMRdevelopment View Post
Haha. with wiring diagrams. I panic and i start seeing blah blah blah blah on the paper. LOL i swear it took me 2 hrs to just wire my deck O_O and its just plug and play LOL

I'll give that diagram a shot though. Thanks again RonJ
The biggest problem with the diagram and the reason I didn't post it earlier are that some of the voltage troubleshooting requires an above-average scan tool.
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Old 12-15-2009, 05:25 PM   #13
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Make sure you use the same Gauged wiring when creating a extension.
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Old 12-15-2009, 05:38 PM   #14
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This site has more good information about O2 sensor wire splicing.
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Old 12-17-2009, 11:30 AM   #15
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ah man are you saying i gotta rewire? im pretty sure my saudering was good enough, i even electrical tapped the outside from the weathering. i believe it could be my wire guages as they were only a slight bigger
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