What is a P0139 diagnostic code? I have a 2006 Kia Rio and the check engine light suddenly came on.

Probably replaced a good sensor. This codes could be from a bad sensor, a vacuum leak, or an exhaust leak before the sensor.

The abs light means your anti-lock brake system has detected a fault and probably isn't working. Your check engine light probably came on at the same time. Get a mechanic or someone with a car computer code reader to connect to the diagnostic port under the dash and read off the error codes to diagnose your problem better.

I googled your make model year and code.
these are the things I found: http://www.kia-forums.com/do-yourself/33370-all-kia-trouble-codes.html
This one seems to say don't wash your engine bay. But cold weather and condensation may bring enough moisture to creat problems. http://www.kia-forums.com/3g-2006-5-magentis-optima/67042-strange-things-afoot.html
http://www.autozone.com/repairguides/Kia-Sportage-1998-02/Diagnostic-Trouble-Codes/2-0L-L4-Std-3/_/P-0996b43f8038273f#hd1-1-4

That is the O2 sensor AFTER the CATALYTIC converter. its meaning is TOO LEAN. That means it could be related to a bad sensor or an exhaust leak.

the check engine light comes on to tell you there is a problem with something the computer controls or receives info from. Have the computer scanned for codes. Once you have those codes post them here and I'll be happy to help you further.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

If it is indeed a 2004 Kia Rio, this is the answer. It is a communication signal protocol, not a code.

Year Make Model in all questions please.

https://www.kia-forums.com/threads/odb-code-iso-9141-2.169418/

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Could be a weak coil on number 4 cyl.
Switch coils between 3 and 4 and see if the code now reads #3 misfire,then you will know you need a coil.
Maybe the check engine light will stay off after the switch.

bank 1 sensor 2. yes it is after the catalytic converter

take to an auto store most such as auto zone / advanced auto offer the scan for free the code will narrow down where the problem is so u can repair the car

that code definition is "Evap high purge flow fault". It means you may have a problem with the evaporative system. this system routes fuel fumes back to the fuel tank. If you want to try and clear this code, find the radio code for your car and then disconnect the battery for 30 seconds. Reconnect the battery and the check engine light should be out. You will then need the radio code to reset your car stereo. the check engine light may stay off if the condition was a transient one. If not, the light will come back on after you drive the car two drive cycles. That is: two starts, warm ups and shut downs. If the light returns, have a mechanic check it out.