Join Date: Sep 2016
Location: USA, NY
Drives: 09 kia spectra ex
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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 !
Last edited by MIA KIA 09; 01-09-2017 at 10:44 AM.
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