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Old 08-01-2013, 05:08 PM   #1
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Exclamation P0155 Bank 2 sensor 1 code

My CHeck eng light came on.... ran the code and came up with the above. I have an 03 Inline 6 ..... how do I know which sensor is bad / to replace ... also where are they located .... thanks

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Old 08-01-2013, 05:56 PM   #2
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#2




NTK 23138 available at rockauto for $40.99. Avoid a Bosch oxygen sensor at all costs.

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Old 08-01-2013, 06:38 PM   #3
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thanks.... where on this diagram above is it located ?
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Old 08-01-2013, 06:43 PM   #4
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Quote:
Originally Posted by Heidi Ho View Post
thanks.... where on this diagram above is it located ?
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Old 08-01-2013, 06:45 PM   #5
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Originally Posted by Heidi Ho View Post
thanks.... where on this diagram above is it located ?
Should be the sensor labeled #2 in that diagram
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Old 08-01-2013, 07:04 PM   #6
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thanks.... I was not able to find that part number listed above 23138 ???
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Old 08-01-2013, 07:05 PM   #7
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More Information for NTK 23138
never mind I found it .... this is the one I need right
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Old 08-01-2013, 07:07 PM   #8
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More Information for NTK 23138
never mind I found it .... this is the one I need right

Yes. On the rockauto site use the catalog - Jeep>2003>Wrangler>4.0L>Emission>Oxygen Sensor>NTK Part # 23138

You can also double check it on the NTK oxygen sensor site.
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Old 08-01-2013, 07:24 PM   #9
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Ty !!!!
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Old 11-13-2013, 10:32 AM   #10
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My CEL came on about a week ago and was reading P0155, so I replaced the bank two - sensor one and cleared out the code. Good news
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Old 11-13-2013, 10:53 AM   #11
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2004 Jeep Wrangler X, Automatic

My CEL came on about a week ago and was reading error P0155, so I replaced the bank two - sensor one (with NTK part) and cleared out the code. Good news is...the error code is gone, bad news is...I've actually lost gas mileage.

I was getting about 16 mpg (16.5 max) before the sensor went bad and about 13 mpg when the CEL came on. After the change I'm getting about 12-13 mpg average. Shouldn't the mpg have gone back up again after the fix?

Note: I live in the northeast and it has been MUCH colder out the last few days. Could this attribute to the loss as well? My jeep is garaged and not sitting idling to warm up but I don't know if other cold factors come into play.

Any thoughts or suggestions on cause or possible fixes would be much appreciated. Thanks all.
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Old 01-10-2014, 11:58 AM   #12
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Sorry to drag up a possibly dead thread but does this look like the correct part:
01 03 Jeep Wrangler Grand Cherokee New Oxygen Sensor O2 Mopar Factory | eBay

I have a 03 X Auto 6 4.0l

Thanks for all the help!, this is my first post on the forums
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Old 01-10-2014, 12:01 PM   #13
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Here is a better diagram where I put the part/code numbers on it. Should clear up any confusion.
Attached Thumbnails
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Old 01-10-2014, 12:12 PM   #14
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thanks!!!!
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Old 04-16-2014, 05:41 PM   #15
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I have the P0155 code come on while trying to fix a misfire condition. Will the O2 sensor cause a miss?

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