Intermittent Check Engine Light, P0139 -
LinkBack Thread Tools
post #1 of 1 Old 04-05-2014, 10:09 AM Thread Starter
Registered User
2000 WJ 
Join Date: Jul 2012
Location: Concord
Posts: 121
Intermittent Check Engine Light, P0139

Hey all, I have a 2008 Jeep Patriot (2.4L engine) that intermittently has the check engine light on, always with the code P0139. The trouble code is for the Bank 1 Sensor 2 oxygen sensor or an exhaust leak so I went ahead and replaced the lower oxygen sensor (not the one in the engine bay, the one underneath the car to the right of the driveshaft) but the MIL still comes back on. Does that mean I would have an exhaust leak instead? I couldn’t find one for the life of me. What I did find though is a TSB that says this problem was found in Jeep Patriots and to fix it the PCM needs to be re-flashed. My question to you all is, do I have an exhaust leak or did the previous owner not get the PCM re-flashed when the TSB came out? Also, if the TSB came out in 2008, do I have to pay to have the re-flash done in 2014?


Last edited by ronj35; 04-05-2014 at 10:10 AM. Reason: added link to TSB
ronj35 is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome