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P0138 code, what to replace?

 
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Old 04 Mar 2012, 09:45 pm
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Question P0138 code, what to replace?

Ok so I have the dreaded "P0138 HO2S Circuit High Voltage Bank 1 Sensor 2" code. It comes and goes, more on than off. What exactly do I need to replace?
I thought it represented one of the oxygen sensors but not sure.
Thank you for any help
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Old 04 Mar 2012, 09:51 pm
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Default Re: P0138 code, what to replace?

The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)

SymptomsThere may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.

CausesA code P0138 may mean that one or more of the following has happened:

Faulty O2 sensor
Short to battery voltage in O2 sensor signal circuit
High fuel pressure (not as likely)
Possible SolutionsHere are some potential solutions:

Replace O2 sensor


got this from google
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Old 04 Mar 2012, 10:52 pm
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Default Re: P0138 code, what to replace?

Thank you very much soyomb!
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Old 05 Mar 2012, 12:24 am
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Default Re: P0138 code, what to replace?

you are very welcome. glad i could help.
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Old 05 Mar 2012, 07:09 am
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Default Re: P0138 code, what to replace?

I'm very familure with that code since replacing my o2 sensor recently. Turns out the 'new' sensor I bought was faulty and it was throwing up the code. As mentioned I didn't notice any difference in driving but only way to get rid of the code was a new sensor as soyomb posted.
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Old 05 Mar 2012, 07:23 am
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Default Re: P0138 code, what to replace?

Quote:
Originally Posted by davea300 View Post
I'm very familure with that code since replacing my o2 sensor recently. Turns out the 'new' sensor I bought was faulty and it was throwing up the code. As mentioned I didn't notice any difference in driving but only way to get rid of the code was a new sensor as soyomb posted.

We recommend OEM, factory Chrysler sensors only. No aftermarket parts store look-alikes. Like most of us here, I get mine from my local dealer. We've heard to many stories of other than factory sensors failing and the only cure was to replace with a factory sensor.

Jerry
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Old 05 Mar 2012, 09:21 am
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Default Re: P0138 code, what to replace?

I have replaced spark plugs before to get rid of that code. Air fuel mixture as others have stated also can contribute to o2 codes.
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Old 05 Mar 2012, 02:09 pm
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Default Re: P0138 code, what to replace?

Quote:
Originally Posted by wwpptc View Post
We recommend OEM, factory Chrysler sensors only. No aftermarket parts store look-alikes. Like most of us here, I get mine from my local dealer. We've heard to many stories of other than factory sensors failing and the only cure was to replace with a factory sensor.

Jerry
Yup, guilty on that one! Learned the hard way but seller took the non chrylser sensor back and refunded my money so I was lucky!
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