Intermittent Check Engine Light, P0139 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Compass & Patriot Forum > Intermittent Check Engine Light, P0139

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineGrizzly Lockers available at Rockridge4wd.comThe ULTIMATE "Selectable" Locker System! Brough

Reply
Unread 04-05-2014, 10:09 AM   #1
ronj35
Registered User
2000 WJ 
 
Join Date: Jul 2012
Location: Concord, MA
Posts: 113
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?

Thanks!


Last edited by ronj35; 04-05-2014 at 10:10 AM.. Reason: added link to TSB
ronj35 is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

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.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.