Question about 2005 Chrysler Town & Country

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O2 sensor code po138 is it something a handy but not car savy person replace?

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P0138 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)
The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)

Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.


Causes: A code P0138 may mean that one or more of the following has happened:

  • Faulty O2 sensor
  • Short to battery voltage in O2 sensor signal circuit
  • High fuel pressure (not as likely)

Possible Solutions, here are some potential solutions:
  • Replace O2 sensor
  • Repair short to battery voltage in o2 sensor signal circuit

Hope help with this (remember comment and rates this).

Posted on Jul 22, 2010

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Posted on Jan 02, 2017

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What does toyota codes PO037 and PO136 mean?


P0037 is "Heater Control Circuit Low Bank 1 Sensor 2".
P0138 is "Oxygen Sensor High Voltage".

It sounds like it's time to check the connector to your oxygen sensor, and probably replace it (the O2 sensor).

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2002 mercury villager code po325 code po138 code po139


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Service engine light


do you have two o2 sensors after catalytic con.could be not good.

Mar 07, 2013 | Cars & Trucks

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How engine performance is affected by bad o2 sensor po138


Hey, The o2 sensor affects the fine tuning of the engine. it is used to tell how well the engine is burning off the fuel in the combustion process. if there is too much oxygen, then it will adjust the air/fuel mixture accordingly and vice versa. If the car runs too lean or to rich you will loose power and possibly damage your engine. It would be a good idea to replace if its faulty.

12_29_2012_11_58_16_pm.jpg

Dec 29, 2012 | 1997 Cadillac DeVille

1 Answer

Engine light came on. i have a programer and this is the code it read out to me po138 u2 (h02s-12) ckt (h1, s2)


A code P0138 may mean that one or more of the following has happened:
  • Faulty O2 sensor
  • Short to battery voltage in O2 sensor signal circuit
  • High fuel pressure (not as likely)

Here are some potential solutions:
  • Replace O2 sensor
  • Repair short to battery voltage in o2 sensor signal circuit

Hope helps (remember to rate this).

Oct 14, 2010 | 2003 Ford Taurus

1 Answer

96 Ram 1500, 5.9 litre. code PO138 sensor circuit


it will be the o2 sensor after the cat.. check the connections. the first bank should be the right side of the engine while sitting in the car. look at that side of the exhaust.

If you need further help, reach me via phone at https://www.6ya.com/expert/ayron_57e1b351b7242eef

Jul 20, 2010 | 1996 Dodge Ram 1500 Club Cab

1 Answer

Po138 code on 96 chevy tahoe 5.7l where do i start testing


P0138 is a code for an unexpected high voltage in the post cat o2 sensor on the left side (bank 1 sensor 2). It often is a result of an internal short between the oxygen sensor heater and the actual oxygen sensor. I would clear the core and if it returns replace the sensor.

Oct 06, 2009 | 1996 Chevrolet Tahoe

1 Answer

2001 Nissan Maxima service engine light stays on code from Auto Zone scanner is PO139 and PO138. What should my next step be to solve this problem.


code p 0138 refers to 2 items
1--heated oxygen sensor(HO2S) 2 bank 1--high voltage ==causes --wiring short to positive --HO2S---ECM
2--oxygen sensor (O2S) 2 bank 1--high voltage ===causes wiring short to positive ---ECM
code p 0139 refers to 2 items
1--- heated oxygen sensor (HO2S) 2 bank 1--slow response ===causes --heating inoperative --wiring--ECM
2--oxygen sensor (o2S) 2 bank 1 slow response ===causes --wiring --- O2S

heated oxygen sensors9HO2S) are in the exhaust manifold before the cat converter
Oxygen sensors (O2S) are after the cat converter
it is indicated that the HO2S is faulty-
check the wiring and /or replace both sensors

Nov 16, 2017 | 2001 Nissan Maxima

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