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O2 sensor fault code

 
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  #1 (permalink)  
Old 25 Nov 2011, 09:42 am
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Default O2 sensor fault code

I recently installed a new downstream o2 sensor on my 2005 manual pt ( uk spec). I kept getting a fault code telling me it was showing low voltage. Now its replaced the code i get is po138 o2 sensor showing high voltage. If I turn off the eml light i could drive for a day or two and then it comes back on again. The new sensor came with the electrical connectoralready on it. Any ideas?
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Old 25 Nov 2011, 01:19 pm
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Default Re: O2 sensor fault code

The fault codes will say Bank 1 sensor 1 or Bank 1 sensor 2. There's only 1 bank of sensors and sensor 1 is up by the exhaust manifold (upstream), sensor 2 is by the CAT (downstream).

Are both your fault codes showing "sensor 2" ?
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Old 25 Nov 2011, 01:57 pm
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Default Re: O2 sensor fault code

From Google:

"O2 Circuit High Voltage Bank 1 Sensor 2"
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Old 28 Nov 2011, 02:36 pm
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Default Re: O2 sensor fault code

Quote:
Originally Posted by CREWZIN View Post
The fault codes will say Bank 1 sensor 1 or Bank 1 sensor 2. There's only 1 bank of sensors and sensor 1 is up by the exhaust manifold (upstream), sensor 2 is by the CAT (downstream).

Are both your fault codes showing "sensor 2" ?
Yes both codes were sensor 2 (downstream). The first code (low voltage) came up 3 times before I replaced the sensor as it was a warning code as opposed to a complete failure (I have a code reader). Second code has appeared a couple of time now. I just had a 30 mile drive in it and no sign of it but I expect it might be back. PT going to get control arms replaced on wednesday so I'll ask to have the sensor checked as well.
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Short ram intake, chrome grill, chrome belt line, drilled/slotted discs, few flames, engine dress up, chrome bits and pieces.
67,000 miles
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Old 05 Dec 2011, 10:41 am
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Default Re: O2 sensor fault code

I've checked and re checked my downstream o2 sensor (which was a direct replacement) connection, fitting and wiring looks ok. Drove for 2 days and the EML stayed off until today and it's back on again with the same code!

From reading other posts I noticed others have translated this code, P0138, to be the upstream sensor needing replaced. I'm certain it relates to the downstream one but my question is with nearly 60,000 miles on a 2005 plate should I replace the upstream as well in the hope it will get rid of the code or do I bite the bullet and take it to a dealer here (which is very expensive in the UK).
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Short ram intake, chrome grill, chrome belt line, drilled/slotted discs, few flames, engine dress up, chrome bits and pieces.
67,000 miles
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Old 07 Dec 2011, 04:51 pm
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Default Re: O2 sensor fault code

I am having the same problem on my 2002 spoke with Chrysler tech and said to definitely change other sensor too which I will be trying in the next day or so will keep you posted.
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Old 08 Dec 2011, 05:01 am
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Default Re: O2 sensor fault code

Quote:
Originally Posted by Mmob8999 View Post
I am having the same problem on my 2002 spoke with Chrysler tech and said to definitely change other sensor too which I will be trying in the next day or so will keep you posted.
That would be great! My check engine light can stay off for miles but always reappears. It makes sense to replace both sensors i suppose. I would have thought that the upstream would have flagged up a code as well though. My idle is a bit jumpy recently as well.
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Short ram intake, chrome grill, chrome belt line, drilled/slotted discs, few flames, engine dress up, chrome bits and pieces.
67,000 miles
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Old 04 Jan 2012, 08:35 am
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Default Re: O2 sensor fault code

Just to update this. It was my downstream 02 sensor that was faulty. I got hold of one from a scrapyards for a 2003 car to fit and see if it got rid of my check engine code.

Turns out it did and the light stays off now. The place I got the 'new' sensor from are taking it back and giving me a refund. Not sure exactly what was wrong with it but I'm happy now.
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Short ram intake, chrome grill, chrome belt line, drilled/slotted discs, few flames, engine dress up, chrome bits and pieces.
67,000 miles
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Old 03 Jan 2015, 10:55 am
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Default Re: O2 sensor fault code

Hi davea300,

I know and fully realize that your post is Now quite old yet if you are hopefully still out there can you kindly explain the steps that are needed to change the Downward 02 sensor as it would be greatly appreciated?

Thank you kindly,
SD
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Old 03 Jan 2015, 11:13 am
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Default Re: O2 sensor fault code

Do you have the special tool to remove the old 02 sensor and install the new 02 sensor? This is important as to keep from damaging the new 02 sensor.
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