p0139 - JeepForum.com

 
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post #1 of 5 Old 07-07-2013, 01:45 PM Thread Starter
mike6114
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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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post #2 of 5 Old 07-07-2013, 03:24 PM
streetglideok
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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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post #3 of 5 Old 07-07-2013, 03:49 PM Thread Starter
mike6114
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is that pre or post cat on driver or pass side?
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post #4 of 5 Old 07-07-2013, 04:28 PM
streetglideok
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Post cat. Bank 1 is driverside, cylinders 1,3,5.
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post #5 of 5 Old 07-07-2013, 04:34 PM Thread Starter
mike6114
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Thank you I'll go to napa in the morning and get a NTK
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