BAD OXYGEN SENSOR PO137 CODE>>LOW VOLTAGE BANK ONE< SENSOR 2

Tiny
HOOKIE
  • MEMBER
  • 1998 KIA SPORTAGE
  • 92,000 MILES
Hello, I had my check engine lite come on my 1998 KIA SPORTAGE 4 cylinder, automatic trani, 2.0 liter engine.
THE AUTO STORE said it was a BAD DOWNSTREAM O2 SENSOR with error code of PO137.
I replaced the sensor and the same code is coming up. Any help MUCH appreciated. It just had a tuneup. The sensor was brand new that the mechanic installed. STANDARD MOTOR.
Please email asap
rnhib@att. Net
thanks
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Tuesday, August 27th, 2013 AT 4:03 PM

28 Replies

Tiny
TY ANDERSON
  • EXPERT
According to the code the issues can be the down stream heated oxygen sensor or wiring from sensor to vehicle's computer. In other words, from the sensor to four wire electrical connecters, wiring circuit is open or electrical connector at computer is damaged or corroded.
Let me know if this answered your question or if you have any other questions. Talk to you soon, Ty
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Tuesday, August 27th, 2013 AT 4:57 PM
Tiny
HOOKIE
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Hi TY
Thank you for your quick response. The electrical connector (4 pin) is in a very difficult spot to reach on this kia sportage. Its a downstream O2 sensor. I will check what you told me to check.
I'd also like to ask, according to the code displayed, the car is running too lean. Would a clogged or bad fuel filter give the same code?
I will check the wires and connector. This is the 2nd sensor and its giving a PO137 and also the guy said something about another code=heater.
Thanks so much for your help!
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Tuesday, August 27th, 2013 AT 6:55 PM
Tiny
HOOKIE
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Ty
sorry to bother you, but where is the computer located on this car. It looks like there are a few different. Ones under the dash. But not certain where the main one is that the downstream O2 sensor goes to. Could a bad fuel filter cause it to give this cade, or is the code specific for an OXYGEN SENSOR. It said banl 1, sensor 2. Replaced the downstrem 2x as I said, still the check engine lite is on. Its really hard to reach the connector. Next to impossible to reach. Any help appreciated.

RE: 1998 KIA SPORTAGE 4 dr. Automatic trani, 2.0 liter engine. Code PO137
CHECK engine lite on
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Wednesday, August 28th, 2013 AT 4:01 PM
Tiny
TY ANDERSON
  • EXPERT
It's not a problem! The ECM (engine control module) is located below the right side of dash under carpet.
The fuel filter would not just cause the P0137 fault code only it would cause a lot of other codes as well as drivability problems.
If you can see the downstream wiring check for any damage to the wiring. Then disconnect the negative terminal from the battery and check the wiring coming into the computer because it sounds like it would be easier.
Some more questions
Have you checked the o2 sensor fuse in the under hood fuse box it is titled "o2 sen"? Does your vehicle have an exhaust leak (ticking sound on a cold start that decreases in sound when warm).
Talk to you soon, TY
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Wednesday, August 28th, 2013 AT 8:55 PM
Tiny
HOOKIE
  • MEMBER
GOOD MORNING TY
very hot here in Florida. NOt good temp to work on cars! In Florida. I looked under my 1998 KIA sportage hood for the fuse box u told me to check for the PO137 ERROR CODE. Check engine liight on. YOu said to check O2 sensor FUSE, but all I see are the following: I see EGI MAIN, FUEL PUMP, FUEL INJ, ADD 30 amp. MAIN 80 amp, BTN 60 amp, IGN 40 amp, P/window 40amp, then MAIN 15 amp, ABS 30amp, and HEAD 20 amp. THE EGI MAIN AND FUEL PUMP look like relays. The rest look okay.
I just hate to keep spending $ on O2 sensors. I also don't hear any exhaust leaks. The rear tailpipe fell off, but we had it replaced. The exhaust shop didn't say anything about a ln exhaust leak.

Someone else told me to check the COOLANT TEMP sender. What would that have to do with a PO137 code?
The wiring looks too complicated for me.I found where the computer was. Just like you said, but you can't see the wires.I have to remove everything. If I undo the battery, will it clear the check engine lite? As I said, the auto store cleared it, and the code came back a few minutes later while, driving.
Thanks for all your Help. Gail
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Thursday, August 29th, 2013 AT 7:35 AM
Tiny
HOOKIE
  • MEMBER
TY I took it to a shop. Put it on a ift. They said the new downstream O2 sensor had NO voltage going to it. Just like oyu said, its something in the wire harness or computer itself.
There is suppose to be a PASSENGER SIDE fusebox with 02 sensor fuses in it.I can't find the location.I see the one under the hood and the fuse box on drivers kickpanel, but I can't find the box on Passenger side with O2 sesor fuses. Wanted to check them. Do u know where I can find that box.I see the ECU under the carpet on passenger side, but NO fuse box. Any help appreciated.
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Friday, August 30th, 2013 AT 2:05 PM
Tiny
TY ANDERSON
  • EXPERT
The information I was provide called the fuse box "passenger fuse box". It is located NOT on the passenger side as I thought from the name but on where you found the driver side kick panel. According to the wiring diagram for the o2 sensors there are several fuses titled:"meter", "ecu", "fuel pump", "o2 sens", and another "o2 sens". All of these fuses are 10 Amp fuses. The wiring diagram shows one ten amp fuse for each o2 sensor. Check for power at each fuse terminal (with fuse installed). To test the wiring it best to start at one end of the circuit and check for power. If there is no power then you half the wiring and test there. Doing this will narrow your search for an open which I think you have here.
Check for both of the fuses for the o2 sensors then test wiring. If you need more help let me know or how to test the circuit with a electrical tester (multimeter, test light). Talk to you soon, TY
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Saturday, August 31st, 2013 AT 12:10 AM
Tiny
HOOKIE
  • MEMBER
Hi Ty. Yes, I found the fuses jjust as you said on the drivers side. The both O2 fuses were good, as well as the ECU fuse. Can you please explain in simple terms how to check them. Do you have to have key one, or just accesory key on and what and how many volts are you checking. Many thanks.
The mechanics said it would be too costly to fix and trace the open, but hopefully I will find a short or open as the downstream O2 sensor is getting NO voltage. They said it would be ok to drive but gas miles might be affected.

I have a multi meter and test lite. You also said to leave fuses in?
Thank you so much for all your help. I think this is gona be a hard on to fix unless I was a Master mechanic like you.
Alos, excuse any typos. This keyboard doesn't work well.
Thanks so much! Gail
we have a brutal heat wave here (florida). Phew
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Saturday, August 31st, 2013 AT 6:58 AM
Tiny
TY ANDERSON
  • EXPERT
To test for power at the o2 sens fuses turn your key all the way on with out starting your engine. Set your voltmeter to direct current and place the negative probe on the inner wall of a power outlet or cigarette lighter (assuming your power outlet has power and ground) and your positive probe on each metal tab on the top side of the o2 fuses. If your meter reads battery voltage (12.9 +/-1.0) you know you have power to the fuses and on each side of the fuse. Then check for power to the rear o2 sensor. Run a wire tied to the neg. Battery post to your neg meter prob then place pos meter probe on the blue wire w/a green stripe and check for battery voltage. If good then this is where it gets more complicated. Turn the key all the way off and disconnect ECM computer electrical connector switch you meter to continuity and check pin no. 39 it is a solid blue wire and ground (ie power outer wall). If no continuity found then the only thing left is a damaged electrical connector pin either on the 02 sensor or ECM computer which is difficult to test w/o specialized electrical terminal tools.
Hear is some diagrams for your vehicle.
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Saturday, August 31st, 2013 AT 10:28 PM
Tiny
HOOKIE
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Hi Ty.I really, really appreciate all your help. Assuming you are using the inside of the cig lighter as a ground, the meter is reading a weird voltage =177mv on both 02 (10 amp fuses). I am putting the red positive end of test lead on top of each O2 fuse. Unless I am not connecting the leads right, something doesn't read write as voltage?
I may retry again as it raining
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Sunday, September 1st, 2013 AT 4:27 PM
Tiny
HOOKIE
  • MEMBER
Happy Labor day, TY. Sorry to bother you but do email when u get a some free time. I put the car key in the "ON" position and still get @ -177 mv (that is a MINUS) on all 4 metal tabs of BOTh O2 sensor 10 amp fuses. Its so hot its next to impossible to do anything in this heat.I had my meter on battery load test 12 volts when I used it. I don't know if these readings are bad or what is causing this. I will use a second meter and recheck again. Thanks!
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Monday, September 2nd, 2013 AT 7:38 AM
Tiny
TY ANDERSON
  • EXPERT
That doesn't look right to me. If your unsure about the ground on the power outlet you could run some wire right off of the battery ground into the driver side. Is there is way you could send a picture of your meter or a website that shows your exact meter? There are so many meters out there.
According to the wiring diagram you should get battery voltage with the key on at the fuse terminals. Let me know and we'll go from there.
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Monday, September 2nd, 2013 AT 9:26 AM
Tiny
HOOKIE
  • MEMBER
Ty I tried another meter (CENTECH). Attached black wire to COM, and red wire to VohmmA.
I hope that is correct. NOW I get zero volts on BOTH 02 sensor fuses. In all 4 locations. What could be causing this?
Gail.I set the meter on DC 20VOLTS
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Monday, September 2nd, 2013 AT 3:18 PM
Tiny
HOOKIE
  • MEMBER
TY looks like the fuse pump RELAY turns or passes 12 volts to both o2 sensor fuses
is the relay bad? Or does car have to be running to check for 12 volts at these fuses?
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Tuesday, September 3rd, 2013 AT 5:29 AM
Tiny
TY ANDERSON
  • EXPERT
Yes, the fuel pump relay supplies power to the o2 fuses, You might be able to swap the fuel pump relay with another one (in the under hood fuse box). If there isn't another matching relay (5 pin) then you'll need to jump the relay (bypass the relay by completing the circuit with a large wire) then you can check for voltage at the o2 fuses. Let me know how it goes, TY
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Tuesday, September 3rd, 2013 AT 5:49 AM
Tiny
HOOKIE
  • MEMBER
Hi TY
The 2 kia sportage relays were the same part # and both 30 amp. I swapped them out as you said. Still no voltage to both O2 sensors FUSES.
I really appreciate all your help here. My dad was a service writer and passed away, so I miss his help fixing cars. I hope with oyur help we can figure this out.
Gail
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Tuesday, September 3rd, 2013 AT 8:28 AM
Tiny
HOOKIE
  • MEMBER
TY, do u have any idea what could be the problem on this? Where does the power come that comes into this O2 sensor fuses. From the battery or computer?
I don't know
where else to trace. Does this mean the 2 connectors to the sensors themselves aren't getting 12 volts?
Thanks
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Wednesday, September 4th, 2013 AT 12:34 PM
Tiny
TY ANDERSON
  • EXPERT
You should be getting power on to the o2 sens circuit from the fuel pump relay. The fuel pump relay under the hood supplies power to the fuel pump and also the o2 sensor fuses. Here is a wiring diagram that shows the path of power (highlighted). You may have an open any where between the fuse box on the driver side kick panel and fuse box under the hood specifically on the black wire with blue stripe. It looks like there is possibly a splice within the under hood fuse box that supplies power to the o2 sensor fuses.
Here I attached the actual diagnostic steps for P0137 fault code titled "98kiasportageP0137"
Pay extra attention to the blue wire it mentions. Although I don't talk about this blue wire above I find it odd at there is no power to the 02 sensor fuses.
Try these steps and then let me know if you have any questions, TY
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Wednesday, September 4th, 2013 AT 8:54 PM
Tiny
HOOKIE
  • MEMBER
TY. YOu said you attached diagnostic steps, but I don't see anything. Just 2 pictures of wiring. Can you send me that attachment "98kiasportagePO137"?You can send attahcemnt to: rnhib@att. Net
that is my email. Thanks
I will have to trace that blue/black wire you mentioned. Does the car have to be running to check O2 Fuse power to both fuses, or just run position(key)
thanks

too hot to work on it outside!
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Thursday, September 5th, 2013 AT 12:54 PM
Tiny
HOOKIE
  • MEMBER
TY
okay, I decided to try to check both (1998 KIA SPORTAGE) O2 sensor fuses with car RUNNING and both show voltage in all 4 spots(metal tabs). When ignition switch is is the "RUN" position, there is NO votage to both O2 sensore fuses, but with car running, there is voltage to both O2 sensor fuses. Don't know where to go from here.
Thanks
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Thursday, September 5th, 2013 AT 1:39 PM

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