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2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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nugentc
Novice
Oct 31, 2013, 6:28 AM
Post #1 of 10
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2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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Hi. I have a 2006 Pontiac Vibe with 132,000 miles (engine 1.8 L Inline 4-cylinder). I recently got CEL codes p0136 and p0138 so I changed the rear oxygen sensor. CEL was still on afterward and I didn't know I needed to manually clear the codes, so I went to have them read--still p0136, 0138, but then p2195 in addition. Then I learned I had to clear the codes myself.
After I did this, within a day, CEL came back on and p0138 is the only current code. I have checked the 3 fuses for EFI under the hood but don't know what else to check. Apparently this code error is related to a short to battery voltage in the 02 sensor circuit.
Any ideas about how to find and fix my problem?
Thank you!
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 31, 2013, 6:41 AM
Post #2 of 10
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Re: 2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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No, that's not what that code means at all. It means the sensor is reporting higher voltage than it should. That can mean there is a problem in the circuit, an air leak in the exhaust or it could also mean the fuel mixture is too rich. It needs to be diagnosed properly.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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nugentc
Novice
Oct 31, 2013, 7:18 AM
Post #3 of 10
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Re: 2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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Here is where I found information for that code to diagnose the problem:
link deleted
It says one of the following is a problem:
Faulty O2 sensor Short to battery voltage in O2 sensor signal circuit High fuel pressure (not as likely)
links deleted .......... not allowed
(This post was edited by Hammer Time on Oct 31, 2013, 8:00 AM)
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Discretesignals
Ultimate Carjunky
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Oct 31, 2013, 8:18 AM
Post #4 of 10
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Re: 2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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Something worth checking out:
TSB #10-06-04-010: Intermittent MIL/Check Engine Light
On, DTCs P0607 and/or P0138, Vehicle Stability Control
Lamp On, Driveability Concerns in High Ambient
Temperatures with A/C On (Clean HO2S Connector and
Inspect...) - (Jul 22, 2010)
Condition
Some customers may comment on an intermittent MIL/check engine light and/or an illuminated
vehicle stability control light. They may also comment about driveability concerns in high ambient
temperatures with the A/C on.
Upon further diagnosis, a technician may find DTC P0607 and/or P0138.
Cause
This condition may be caused by water leaking from the evaporator onto the electrical connector in
the center IP area. The evaporator drain may be restricted, causing water to drip from the
evaporator case onto the post HO2S connector. This creates a path for current to flow from the
heater circuit to the HO2S signal circuit. There may not be carpet wet from this leak, only the
connector.
Correction
Note: The drainage from the HVAC case may not be extensive enough to cause wet carpet or
other damage.
1. Remove the side IP panel then move the carpet back to gain access to the HO2S
connector.
https://docs.google.com/...TKD_Mb1dDOFNodGlMOHM
2. Locate the HO2S connector. Clean the connector with compressed air and apply a
small amount of silicone grease to the connector.
https://docs.google.com/...TKD_MeUVZVGhMaS0yY0U
3. Locate the HVAC core box. Inspect for moisture in that area. If moisture is present, it's
possible that a plugged evaporator drain tube may be the issue.
https://docs.google.com/...TKD_McmVhdW5VNHZORTA
4. Install the carpet back and reattach the IP side panel.
5. Inspect for a plugged evaporator drain tube. Force compressed air up the drain hose to
remove excess water. Drain until a steady flow is achieved and the blockage is cleared.
6. Test drive the vehicle then inspect the evaporator drain tube to verify if it is operating
correctly.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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nugentc
Novice
Oct 31, 2013, 3:49 PM
Post #5 of 10
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Re: 2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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Thanks, Discretesignals. When I installed the new sensor there didn't appear to be any moisture on the connector or around the area. We're at a point now that it's not hot out and we're not using AC. I can still check the evaporator drain tube, though.
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Discretesignals
Ultimate Carjunky
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Nov 1, 2013, 4:51 AM
Post #6 of 10
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Re: 2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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Do you have a scan tool that can read data stream information or a digital volt meter?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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nugentc
Novice
Nov 1, 2013, 6:08 AM
Post #7 of 10
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Re: 2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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My multimeter (although it's not digital) is back in storage in another state. I don't have a scan tool, but the guy at Autozone supposedly read the voltage from the code reader itself for me.
Here were the readings I copied down:
O2S12: .055
O2S11: ranged from 3.2 to 3.5 and perhaps a little higher at times
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nugentc
Novice
Nov 1, 2013, 11:28 AM
Post #8 of 10
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Re: 2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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I just found this document (although the link may get deleted after I post? Not sure the rules on that). Since I did have both p0138 and p2195 at one time, maybe it applies?
So even though p0138 is for Sensor 2, it says to replace Sensor 1. What do you think?
http://ww.w.autoelectricpro.com/purchased/images/110000/109156.pdf
It basically says:
Bulletin Starting Point for Both DTC P0138 and P2195 Set Together
If both DTC P0138 and P2195 are set, replace the HO2S Sensor 1.
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Hammer Time
Ultimate Carjunky
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Nov 1, 2013, 11:33 AM
Post #9 of 10
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Re: 2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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I'm letting that link stay because it's just a TSB but here are the FORUM RULES of what is allowed.
That TSB also states the the computer needs to be reprogrammed in addition to replacing the sensor.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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nugentc
Novice
Nov 5, 2013, 6:47 AM
Post #10 of 10
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Re: 2006 Pontiac Vibe, short in o2 sensor circuit (p0138)
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I just wanted to post an update and some follow-up for anyone else struggling with the same issue. I checked the evaporator drain tube as suggested above and it's actually not located anywhere near the O2 sensor connector in my Vibe. I might have read somewhere else that the TSB related to that is for AWD. I also checked for exhaust leaks and vacuum hose leaks. I went to have the codes read again and was getting the p2195 in addition to p0138.
There were many online forums and several other sources including the TSB I posted indicating that this combination of codes is due to a faulty O2 sensor 1.
So I changed that out on Saturday, have driven it a lot since then, and the light has not returned.
I hope this is helpful to someone else!
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