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P0139 code


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Whats up jeep lovers! My engine light lit today. P0139 The car when im stop at trafic lights sometimes go ...

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Old 05-11-2018, 09:55 PM   #1 (permalink)
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Default P0139 code

Whats up jeep lovers!

My engine light lit today. P0139

The car when im stop at trafic lights sometimes go a little rough. But comes back. I knew that could be some sparks or fuel injector issue.

Is there anyway to fix before take to the the mechanic? Injectors cleaners for example? Or this things doesnt work. Change plugs first?

Tks !!
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Old 05-11-2018, 10:05 PM   #2 (permalink)
 
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That's a slow bank 1 downstream O2 sensor code. Best to get it someplace where they can watch the voltages as its running. Is this a OE sensor? Sometimes the aftermarket ones like Bosch are a bit slow and don't work well on these 3.7s.
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Old 05-12-2018, 02:59 AM   #3 (permalink)
 
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Here is the list of trouble codes,handy to have Link: Generic Chrysler Diagnostic Trouble Code List-
If it needs replacement... only use an NTK sensor.
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Old 05-12-2018, 09:01 AM   #4 (permalink)
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I second this advice. I had the same code, replaced the sensor with a Bosch, reset it, and the code came back on in 20 miles. Had another shop check it out and they replaced that sensor with an NTK sensor. Done a couple hundred miles since and the code hasn't returned. Wish I'd know this info prior, would have saved myself some money .
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Old 05-12-2018, 10:44 AM   #5 (permalink)
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Tks for the replies guys!
But its the sensor itself that is bad or something else could be wrong ? Injectors or sparks for example. Before changing it inwiuld like to know if its sometingh that can be going wrong
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Old 05-12-2018, 12:32 PM   #6 (permalink)
 
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The set diagnostic code is directly related to the bank 1 downstream O2 sensor, it's probably easier to just replace it, and see how the Jeep runs then.
If you want to pay the extra diagnostics fees, from a snap on ultra scanner, feel free to do that, but I'd do the sensor replacement first, to eliminate the code.
The jeep does like new properly OEM gapped spark plugs every 25-35k miles.

Live data from injectors & coil packs & so much more can be tested/seen on the Snap On Ultra Scanner.
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