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Unread 07-07-2013, 01:45 PM   #1
mike6114
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Join Date: May 2013
Location: olean, ny
Posts: 41
p0139

The cle illuminated today and I scanned the eng I received a code of p0139 any idea of what o2 sensor to change or should I change all 4 The Jeep has 47000 miles on it. Thanks

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Unread 07-07-2013, 03:24 PM   #2
streetglideok
Web Wheeler
2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,368
Its the downstream oxygen sensor, on bank 1, that is indicating a slow response. Could be a faulty sensor, or a symptom of another issue. If you go to replace it, use OE, or NTK sensors, not bosch. Avoid autozone, as they like to push bosch product like it cures cancer.
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Unread 07-07-2013, 03:49 PM   #3
mike6114
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Join Date: May 2013
Location: olean, ny
Posts: 41
is that pre or post cat on driver or pass side?
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Unread 07-07-2013, 04:28 PM   #4
streetglideok
Web Wheeler
2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,368
Post cat. Bank 1 is driverside, cylinders 1,3,5.
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Unread 07-07-2013, 04:34 PM   #5
mike6114
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Location: olean, ny
Posts: 41
Thank you I'll go to napa in the morning and get a NTK
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