looking for help to solve code P0139 - Kia Forum
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post #1 of 45 (permalink) Old 01-08-2017, 05:25 PM Thread Starter
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looking for help to solve code P0139

Hello again folks. Background on this 09 spectra, 2.0L automatic,now has 97,500 miles.been chasing this code for a while now. had bad flex pipe,and had replaced. Replaced downstream O2 sensor. Installed new spark plugs as they were close to recommended 100,000 mile(160,000Km) interval. New air filter and Seafoam brand fuel treatment.
Car operates perfectly but daughter is annoyed by the CEL turning on(about every 100 miles) for this code. I have in the yard monitored engine readings and found 2 things that seem odd to me. The EVAP system does not seem to be going thru complete self testing, as its monitor says,yet NOT throwing a code. And from stone cold, ambient air temp reading is correct to a thermometer, but the coolant temp reads on average 35 to 40 degrees warmer(FROM COLD).The last bit of info I can offer is when up to temp the upstream and downstream O2 sensor temps are reading the same temp within a second of each other.
I am contemplating replacing the upstream sensor and replacing the coolant temp sensor, but would love to hear some feedback on this code problem first. Any super sleuths out there that want to take a curious case? LOL
I also have a "hard time" in thinking this could be a catalytic converter problem,as I have never had to replace one other than for massive fuel/oil problem from an engine problem, this runs TOO good !


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post #2 of 45 (permalink) Old 01-09-2017, 11:49 AM
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I'm certainly not a 'super sleuth', but will nevertheless offer up a couple of things from under the shade tree. First off, I wouldn't replace those other sensors if it were mine, given that the vehicle running fine and neither of them should be contributing to setting a P0139. Next I'll ask if you did any electrical testing of the downstream O2 sensor circuit when the CEL is on? That would have been my first step in trying to diagnose this issue, before replacing any parts. JMO, and not trying to be critical of what you've done so far.
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post #3 of 45 (permalink) Old 01-09-2017, 12:27 PM Thread Starter
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Well I certainly welcome the comments! while checking many different online help sites, all suggested to replace the downstream sensor and from my past experiences with my other vehicles that at the current mileage of the Spectra it certainly would not hurt it. And the shop that changed the bad front pipe/ flex pipe reused the downstream sensor. The Spectra started throwing this code shortly after finding that the flex coupler was opening up due to our wonderful rust belt area. Also the fact that it is reading,just slow to read, and is the only code and no rich running or misfires found in the computer. I honestly thought that at mileage the new plugs would definitely take car of it after the O2 sensor didn't. Other than posted info nothing else seemed "out of whack". Daughter has only had the car for 4 months and put 6500 miles on it, and the oil was new when purchased and changed again 2 months ago. And soon to get it again when I can do more checking for this posted inconvenience.We do maintain and not "beat" on our rides. Thanks again for your input would gladly accept any more thoughts.
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post #4 of 45 (permalink) Old 01-09-2017, 01:26 PM Thread Starter
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Well I just got done doing more searching and from google found a thread from right here on the Rio section, Remember I posted of the EVAP system not fully going thru its self test monitor, but no code or pending code. seems this later Rio owner had a gas cap that was not fully sealing. When I can get my hands on the daughters Spectra, I will check out the gas cap. My 04 Chrysler T&C likes to pull a similar code problem(Po420 cat efficiency below specs...) a lot too and have tracked that to a gas cap sealing problem too.Especially in COLD weather! Still open to thoughts.
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post #5 of 45 (permalink) Old 01-09-2017, 01:33 PM
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I to would be reluctant to change out the O2, given that the setting criteria for that code is, a reading of not less than .o2v on deceleration..

The ecu is looking for a cut in fuel on decel, fuel is detected during this event,
items to check,
  • Dirty throttle body, staying open.
  • leaking evap,
  • maladjusted TPS,
  • Leaking FI, lastly,
  • lazy O2

It would be advantageous for you to post the freeze frame data for this occurrence..

.. Philip
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post #6 of 45 (permalink) Old 01-09-2017, 02:03 PM Thread Starter
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Originally Posted by aquanaut20 View Post
I to would be reluctant to change out the O2, given that the setting criteria for that code is, a reading of not less than .o2v on deceleration..

The ecu is looking for a cut in fuel on decel, fuel is detected during this event,
items to check,
  • Dirty throttle body, staying open.
  • leaking evap,
  • maladjusted TPS,
  • Leaking FI, lastly,
  • lazy O2

It would be advantageous for you to post the freeze frame data for this occurrence..

.. Philip
Thank you for the input! but the downstream sensor replacement is water over the dam now and plugs and air filter were due anyway. I will take a close look at the TB, but am strongly thinking in the direction of an EVAP leak as self monitor test has read incomplete the numerous times i have hooked up my scanner. Just where the leak may be is yet to be determined, If there is a leak.
The O2 sensor did not look healthy anyway on the portion that is inside the exhaust. Will not change the other sensors that I said to be considering.
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post #7 of 45 (permalink) Old 01-10-2017, 04:17 AM Thread Starter
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Well this is interesting, My daughter got home from work at 8:00pm EST and said Dad the CEL turned off today! mind you that we saw a 20f rise in temps yesterday, but being late (and dark) out, I did not go out and investigate with my scanner. Will do that in a couple of hours before she heads back out for work. And I will then check the gas cap afterwards. I did question her about it(gas cap) and she said she NEVER lets it go to 1/2 tank, so with the distance she drives she is getting gas every 3 days or less depending on her schedule with also going to her Masters Degree classes! I am strongly thinking gas cap seal! Will keep you all informed ..... and thank you for your assistance!

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post #8 of 45 (permalink) Old 01-10-2017, 07:46 AM Thread Starter
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OKAY here goes! started right up(as usual), and indeed NO CEL! Shut back down after 2 min. run and hooked up scanner,read for codes. P0139 and a second confirm P0139(as usual), EVAP test monitor still showing incomplete. Started back up and watched for TPS at idle,showing 0%, O2 sensor voltage showing average of 1 volt differential between the two O2 sensors. Shut down after another 5 min run time and checked the gas cap, It practically lifted off with no effort and "clicker" action felt rather sloppy. Put cap back on after a light coat of Vaseline applied to the O ring and made sure that I pushed down and cap clicked about 6 times. Went back and cleared the codes,then came in to make my report. I will see how this works out and get ready to buy a NEW gas cap for the car! As of right now I am almost certain that this is the problem(along with my daughters doing things (gas cap tightening) the way her former Escort worked (different tightening action)! Still open for comments/suggestions But thank's to all.
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post #9 of 45 (permalink) Old 01-11-2017, 07:48 AM Thread Starter
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NOT sure, with roughly 70 mile round trip drive(shut down while at work), this am I checked for codes and found the P0139 PENDING and EVAP monitor test still incomplete. It is roughly 40f here this am and when I started the motor, the idle speed was 1550rpm, about 300rpm less than yesterdays reading of 1850rpm at 27f. Daughter will be putting on about 150 miles today as she works and has masters class tonight, with a probable 4 or 5 shut offs during that drive time. Should be a pretty good test to see what is going on,just won't be able to check things tonight as she won't get home until well after 10:00pm EST tonight.
For all you "super sleuths" out there, I will report again tomorrow.
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post #10 of 45 (permalink) Old 01-11-2017, 09:48 AM
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The 1V difference does not compute as the O2 read .01V(lean) to 1V (rich).. a good O2 should be switching with no bias..

Per the evap, i would be investigating the purge circuit.. Solenoid sticking open.. or wiring issue..

... Philip
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