Question about 2002 Nissan Altima

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Need to replace my rear O2 sensor on a 2002 nissan altima

Can anyone help me on how to replace my rear O2 sensor? The code that I got is P0138. I do not have the funds to go to a mechanic and I have heard that I can replace it myself. If anyone could point me in the right direction I would appreciate it

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You will need a 21 or 22mm wrench. follow te exhaust from the engine, you are looking for a sensor that is screwed into the exhaust pipe just past the cat converter. unplug the sensor from the harness thn unscrew the sensor from the pipe. reverse to install.

Posted on May 02, 2010

  • jzep245
    jzep245 Sep 21, 2012

    but in the V6 altima the bank 1 is between engine and dash board can you reach it without dropping engine?? if i take out intake will i be able to reach it??

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Posted on Jan 02, 2017

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2 Answers

What would cause a 2002 Nissan altima to crank but not start after replacing the o2 sensors and the battery?


It should be willing to start even without the O2 sensor. Check that you're getting spark, check fuel pressure.... Check if any codes.

Mar 21, 2015 | 2002 Nissan Altima

1 Answer

2002 mercury villager code po325 code po138 code po139


P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0325 Knock Sensor 1 Circuit (Bank 1 or Single Sensor) -Circuit Malfunction
think you just need a new o2 sensor

Nov 03, 2013 | Cars & Trucks

1 Answer

I had a P0138 code after a diagnostics test on my 2006 dodge ram 1500 4X4, what does this mean?


P0138 DODGE - O2 sensor 1/2 Circuit highxicon.jpghttp://engine-codes.com/p0138_dodge.htmlForum CodePossible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks Tech notes Replacing the rear O2 Sensor bank 1 usually takes care of the problem.

Jul 09, 2012 | 2006 Dodge Ram 1500

1 Answer

P0138(pd02) what does this code mean


P0138 O2 Sensor Circuit High Voltage
Code is for the second O2 sensor and is typically an indication that either the harness has become disconnected, or is wet; or the sensor itself has failed.

Jun 03, 2012 | 2006 Nissan Sentra

1 Answer

Engine code p0138


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)


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

I hope this helps to solve it (remember to rate this answer).

Jan 09, 2011 | 1999 Jeep Grand Cherokee

1 Answer

What is nissan quest code p0138/p0139


P0138 - Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

P0139 - Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)

The Heated Oxygen Sensor (1 or 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)

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

Hope helps (remember to rate this answer).

Oct 11, 2010 | 2002 Nissan Quest

3 Answers

P0138 code


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 helps (remember to rate and comment this).

Sep 15, 2010 | 2002 Jeep Grand Cherokee

2 Answers

PO138-PO139


P0138- o2 circuit high voltage, bank 1 sensor 2
P0129- 02 circuit slow response Bank 1 sensor 2
rear o2 sensor weak, replace it, will be the one after the caliltice converter.

Jul 10, 2010 | 2001 Nissan Quest

1 Answer

My 2001 Pathfinder has an SES light with codes p1140, p0138, p0139... O2 sensors and a cam sensor... O2 sensor replaced, and the swapped the cam sensor with its partner on the other side... 150miles...


Possible mass airflow sensor. A cheaper way to get around paying for the super expensive 2001 Path part is to use the same year maxima sensor since they use the same motor :)

Jan 27, 2010 | 2002 Nissan Pathfinder

1 Answer

My 2002 nissan altima is ideling wierd and I just replaced the mass air fuel censor...Im not sure what the problem could be...any help is greatly appreciated...thanks


You need to see that the Oxygen 2 sensor is okay.

For O2 sensor visit www.densoproducts.com

And run a scan.

Good luck.

Aug 29, 2009 | 2002 Nissan Altima

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