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2009 Rio Base Sedan; 1987 Ford F-150 XLT Lariat
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78 Posts
Discussion Starter #1
1. Car threw P0139 yesterday, which according to this site is "P0139 Oxygen Sensor Circuit Slow Response - Bank 1 Sensor 2". I interpret this to mean, this is the second O2 sensor that monitors the catalytic converter and has no direct effect on driveability?


Either way, I am unable to use my OBD-II scantool to clear the code. When I ask it to erase the code, it just displays "FAIL" and then re-displays the code. How do I clear codes from this car? I've always been able to clear them from previous vehicles of mine, using the scantool.



2. Today, I have noticed a few driveability issues. When I start moving in first gear from a dead stop, the engine will "stumble" once and then immediately pick back up and accelerate normally for the rest of the trip. Occasionally this will also happen in between shifts while accelerating moderately.

A more significant issue happened today also: I was stopped at a stop light and attempted to go when the light was green, but when I released the clutch, the car was "stuck" in place and nearly stalled. It felt like the emergency brake was on and holding the car in place (but it was definitely not on).




Car has 83,500 miles - and if my suspicions are correct about the dealer I bought it from, NOTHING was repaired/replaced before selling the car to me.

Any advice about clearing this code? If it comes back, I'll look into replacing the O2 sensor but I don't want to waste money replacing parts if the code is not persistent.

Any advice about the driveability problems? None of these occurred during the test drive of course, only after I had already purchased the car and taken it home.


Thanks!
 

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2002 Kia Rio, 2011 Kia Sorento 2005 f 250 1996 geo metro 1992 f 150
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1,023 Posts
I would start with a good cleaning of the intake. Clean the iac valve with carb cleaner make sure the valve moves back and forth freely when done. Clean the maf sensor with maf cleaner only. The hose from the PCV get's brittle and makes the engine run rough lets more air into the intake How about a fuel filter also these are cheap things to do. No other codes? Is everything else ok? I hope your first cat isn't blocking up. I can't say about clearing the code except if your scan tool is looking at a pending code maybe you need to look at that keep us informed I hope this help's somwhat and if the car you bought didn't have any maintenance get the timming belt changed ASAP. Good luck Reguard's Ronjohn Oh yes http://www.kiatechinfo.com/ for service info free in the USA just have to register
 

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2009 Rio Base Sedan; 1987 Ford F-150 XLT Lariat
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78 Posts
Discussion Starter #3 (Edited)
Thanks for your reply. So basically the same maintenance stuff I've been been doing on my Escort for years. Not sure why, but cleaning all that stuff never really occurred to me. This is the newest car I've actually had to work on - we take the '10 Accent to the dealership for all service since it has a bumper-to-bumper warranty to 100k miles.

I am concerned about the timing belt, that's for sure. The dealership won't give me a straight answer regarding its replacement at 60k so I'm going to have it done just for peace of mind.

I can re-time my Escort's SOHC in my sleep with one hand tied behind my back, but I am scared to death of DOHC interference engines. I owned a '93 Mazda MX-6 once, and never touched the engine other than plugs/wires/oil. I typically do my own work but I'll have to take the Rio to my mechanic down the street for this job.


Yes, it is a pending code according to the scantool. I didn't notice the little "pending" icon yesterday. Since it's a pending code, I guess there's nothing I can do to clear it other than unhooking the battery to reset the computer. I'm not opposed to spending the money on a new O2 sensor, but I want to make sure it is actually bad before dropping the cash.

There are actually TWO instances of P0139. One is "pending" and the other is "snapshot". Not sure what the significance of that is.


Nothing else seems to be wrong with the engine. It's super noisy (no "bad" noises, just loud) but from what I read online, this is typical of these cars. It runs smoothly and seems to have the expected amount of power and throttle response except when it acts up. All engine fluids are at the correct levels - but I can't vouch for the transmission fluid (manual trans) since I haven't checked it yet.
 

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2002 Kia Rio, 2011 Kia Sorento 2005 f 250 1996 geo metro 1992 f 150
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1,023 Posts
Good job on that timming belt. Piece of mind is a good thing. I've been there with my sons car 02 134k on it git er done. I don't know what scan tool you use but I never had a problem clearing codes with mine sometimes it takes turning of the key for 10 seconds but who knows. I only said about the cleaning because i had an issue with a p01166 which i did all the maint replaced a bunch of stuff. Plug's,wires fuel pump, fuel filter it turned out to be a blocked 2nd cat. busted it out it runs good now and he has new part's to travel back and forth from Penn state Harrisburg again piece of mind . Is snapshot like freeze frame data? it should clear i would think. I wish you luck with it. Reguard's Ronjohn
 

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2008 SpectraSX, 2014 Optima LX,2006 Jeep Liberty, Linux Mint Mate
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As far as the OBDII scanner not clearing the code... The ignition switch needs to be in the ON position BUT with the engine NOT running... If the engine is running you CAN'T clear codes.
I'd also look into cleaning the MAF sensor... My wife had an 96 Mercury Mystique that acted just like your description of problems... The MAF was bad... Replaced...no more stumble, O2 sensor errors, and no more lag on acceleration.
Clean it ONLY with MAF spray cleaner and DO NOT touch the sensor with anything as they are VERY delicate.
Dave
 

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2012 Kia Sportage EX, 2015 Kia Optima EX, both black
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I have had this error before, and it comes and goes P0139. My 2005 Rio (manual trans) has had that sudden hesitation once in a while its whole life since I got it at 29,000 miles, it seems to come and go. I did a seafoam into the break assist line last weekend, and the P0139 came back a couple days later. Cleared it tonight (even if pending you can clear, just don't have the engine running, you cant clear codes unless the car is "on" but not running yet from my experience with this car.

So, I next want to remove the 2nd O2 sensor and brush it off or replace it, and clean the throttle body. I looked at videos on cleaning throttle bodies, it looks like this cars is "under" the air filter housing, anybody know best way to get that off and to clean the throttle body? Also, where the 2nd O2 sensor is at under the car? I have two silver colored canisters in the exhaust under there must be the cadys where is it in regards to those?
Here is a picture of my throttle body area:

https://skydrive.live.com/redir?resid=BE6E38CCC8860024!1137&authkey=!AP6AeD_gsfFr09o
 

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2008 SpectraSX, 2014 Optima LX,2006 Jeep Liberty, Linux Mint Mate
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Buy yourself a can of Chevron Techron and dump it in your gas tank...I have read a few posts where this has cleaned the O2 sensors and cured the problem.
Check it out at Advanced Auto and read the reviews..
Buy Chevron Techron Concentrate Fuel System Cleaner (20 oz.) 65740 at Advance Auto Parts
No "smoke and mirror" garbage ...it works...

As far as the car stuck in place...have you done the required maintenance found in your owners manual...like drain and refill the Automatic transmission EVERY 30k miles???
I'd bet not.. Like most KIAs it gets ignored until tranny problems exist... Use ONLY KIA/Hyundai Diamond type III fluids or Valvoline MaxLife (see PDF file located on my Google Drive)
https://docs.google.com/file/d/0B-YuNuTyh57Xa0dwMnQ2MHZLbVk/edit?usp=sharing
I meets and/or exceeds OEM specs for KIAs (look under Mitsubishi Diamond III) and IS safe to use in your car... Don't be surprised that our car will shift smoother also...
Dave

Dave
 

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2012 Kia Sportage EX, 2015 Kia Optima EX, both black
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15 Posts
P0139, Oxygen Sensor Circuit Slow Response, with my 2005 Kia Rio was caused by a bad seal on the gas cap. Found that if I super tightened it, i went 6 months without it reapparing. Came back this week because it was so cold Monday when I filled up the tank I wasn't able to tighten it enough (it clicks but you gotta push and turn to make it really seal), so I spent 10$ today on a new gas cap at napa after clearing the codes at napa. But yeah this problem with P0139, and some "hesitation" was totally caused by the gas cap. I found this out after doing all sorts of things like doing the seafoam (including injecting direct into break assist method), and it still happened until I realized the code would appear only once in a while recently after filling the tank.

Try getting a new gas cap and maybe you'll be in the same boat as me.
 
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