Question about 1996 Geo Prizm

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Replace rear O2 sensor

How do you replace the rear O2 sensor

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  • Geo Master
  • 1,209 Answers

It is quite simple, you un-plug the sensor from the harness, usually there is a plastic lock tab you must remove before you can disconnect the plug. Then you will need a special socket specifically made for O2 sensors. They tend to get corroded into the tailpipe so you might need to use a breakover bar to get the old sensor moving, in extreme cases I have had to get a torch to the bung around where the sensor is threaded in. anyway, once you get the old sensor out make sure you use a bit of anti-seize on the threads when you install the new one.

Posted on Apr 21, 2013

Testimonial: "I"m referring to rear O2 sensor, the wiring connector goes up into the car some where, but WHERE!!!!!"

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Related Questions:

1 Answer

Where is the rear O2 sensor located on a 2007 Camry Hybrid?


It is just aft of the last catalytic converter. It is not an O2 sensor, it is a catalyst efficiency monitor.

Jul 05, 2016 | 2007 Toyota Camry Hybrid

3 Answers

Check engine code p0137


P0137 - Oxygen (o2) sensor circuit low voltage (Bank 1 sensor 2)
If you have more than one (1) sensor on Bank 1 then it will be the rear sensor. Change the o2 sensor. You may also want to check the following:
  • Repair exhaust leak near the rear sensor (if leak is found)
  • Check for restriction in catalyst and replace as necessary
  • Repair short, open, or high resistance on o2 signal circuit

  • Most likely you will just need to replace the sensor. Hope this helps you.

    Jul 05, 2013 | 2002 Honda Odyssey

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    2001 Toyota Camry - check engine light on - code p0420 - took to mechanic and he just hooked up code scanner and gave p0420 code - without checking anything else he said rear O2 sensor needs to be...


    Hello: Code 420 normally indicates a catalytic converter is operating below 60% efficiency. You need to take your car to another shop and request a COMPLETE diagnosis not a dart board guess.

    Sep 13, 2011 | 2001 Toyota Camry

    1 Answer

    2005 toyota tacoma 2.7 code p0037 replace rear 02 and computer code keep coming back.


    P0037 - 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

    If you replaced the O2 sensor, then its possible that you have some electrical problem there; reset the codes first, and if this come on again, check in this link TSB P0037 electrical diagnostic procedure.

    Keep us updated.

    Jan 27, 2011 | 2005 Toyota Tacoma

    2 Answers

    Catalyst system efficiency below threshold


    is that the code you get from comp is PO420 eng light if so worst news either you have an exh leak between o2 sensor 1 and o2 sensor 2 or the front o2 sensor is lazy or the front catyletic converter is not working

    basicaly code is only triggerd when engine is hot and the front o2 sensor and the rear o2 sensor read the same voltage when conv is working the front o2 sensor will fluctuate rapidly from 0v to 1v and rear o2 sensor will remain steady at 0.5v

    try to explain best i can plz vote comment or reply if you need more help

    Jan 17, 2011 | Chevrolet Astro Cars & Trucks

    1 Answer

    What is the code P0137?


    A code P0137 may mean that one or more of the following has happened:

    • Faulty o2 sensor Exhaust leak near the rear sensor
    • Plugged catalyst
    • Short to voltage on O2 signal circuit
    • High resistance or open on O2 signal circuit
    • solutions are
      • Replace faulty sensor
      • Repair exhaust leak near the rear sensor
      • Check for restriction in catalyst and replace as necessary
      • Repair short, open, or high resistance on o2 signal circuit

    Nov 27, 2010 | 2000 Chevrolet Silverado 1500

    1 Answer

    Check engin light on. There are four error codes P0137,P0141,P0342, and P1792. How do I fix it. Will I pass inspection with these codes?


    P0137 Error code Faulty O2 sensor Exhaust leak near the rear sensor
    • Plugged catalyst
    • Short to voltage on O2 signal circuit
    • High resistance or open on O2 signal circuit
    Possible Solutions
    • Replace faulty sensor
    • Repair exhaust leak near the rear sensor
    • Check for restriction in catalyst and replace as necessary
    • Repair short, open, or high resistance on o2 signal circuit
    P0141 Error code means Downstr Heated Oxygen Sensor Heater circuit fault - Bank No. 1.

    - replacement is needed for this issue.

    P0342 Error code means Camshaft Position Sensor Circuit Low Input

    P1792 Error code means P1792 means the computer isnt properly programmed so if this code keeps comming back the pcm may need to be replaced


    Aug 13, 2010 | 2002 Daewoo Lanos

    1 Answer

    I have code p0137 coming up on my 2003 jeep grand cherokee laredo what does the code mean?


    P0137 - Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)

    Essentially the same as P0136, P0137 refers to the second oxygen sensor on Bank 1. P0137 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 2 is located to the rear of the catalytic converter and should produce an output signal relative to oxygen storage capacity of the catalytic converter. This rear (sensor 2) sensor is less active than the signal produced by the front sensor. However, if the ECM senses the sensor is inactive, this code will set.

    Symptoms: There may be no visible symptoms to the driver, other than the MIL (Check Engine / Service Engine Soon) illumination.

    Causes: A code P0137 may mean that one or more of the following has happened:
    * Faulty o2 sensor Exhaust leak near the rear sensor
    * Plugged catalyst
    * Short to voltage on O2 signal circuit
    * High resistance or open on O2 signal circuit

    Possible Solutions:
    * Replace faulty sensor
    * Repair exhaust leak near the rear sensor
    * Check for restriction in catalyst and replace as necessary
    * Repair short, open, or high resistance on o2 signal circuit

    Hpe hti shelps (remember comment and rated this).

    Jul 26, 2010 | 2003 Jeep Grand Cherokee

    1 Answer

    Po137/po157 codes no activity


    P0137 / P0157-Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2) refers to the second oxygen sensor on Bank 1. P0137 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 2 is located to the rear of the catalytic converter and should produce an output signal relative to oxygen storage capacity of the catalytic converter. This rear (sensor 2) sensor is less active than the signal produced by the front sensor. However, if the ECM senses the sensor is inactive, this code will set.

    A code P0137 may mean that one or more of the following has happened:

    Faulty o2 sensor Exhaust leak near the rear sensor
    Plugged catalyst
    Short to voltage on O2 signal circuit
    High resistance or open on O2 signal circuit

    Possible Solutions…
    Replace faulty sensor
    Repair exhaust leak near the rear sensor
    Check for restriction in catalyst and replace as necessary
    Repair short, open, or high resistance on o2 signal circuit

    Mar 08, 2010 | 2000 Chevrolet Camaro

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