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02 sensor location and replacement

Tiny
JON WILKINSON
  • MEMBER
  • 2002 HONDA CRV
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 119,450 MILES
I am trying to find the least expensive way to replace the 02 sensors on a 2002 honda crv. I have found inexpensive ones on the enternet and would like to know if they can be used.

and where are the sensors located?
Friday, September 19th, 2008 AT 12:02 PM

26 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi jon,

There is a Chinese saying, every cent is worth its quality. Usability is not a problem but reliability is a question mark.

There are 2 sensors, located before and after the catalytic converter on the exhaust system under the vehicle

Here's a guide on how to replace the oxygen sensor

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

See the pictures below for locations
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Friday, September 26th, 2008 AT 11:32 AM
Tiny
DEEPAK05
  • MEMBER
  • 5 POSTS
  • 2004 HONDA CRV
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 77,000 MILES
Hi Experts,

Check Engine light is on in 2004 Honda CRV. Went to Autozone and they read the code and provided the following information

************************************

Troubleshooting : P0134
OEM Brand : Honda

Definition
A/F Sensor 1 heater System Malfunction
Probable Cause
- Open or Short circuit Condition
- Poor Electrical Connection
- Faulty A/F Sensor 1

TroubleShooting : P0135
OEM Brand : Honda

Definition
A/F Sensor 1 heater System Malfunction
Probable Cause
-Open or Short Circuit Condition
-Poor Electrical Connection
-Faulty A/F Sensor 1
***********************************

It seems the issue is with Oxygen Sensor when I looked at the Internet.
I have tried to shop around in Internet and found there are 2 types of Oxygen sensors and I am confused which one to buy.

My question here is,

Do I need to replace the Oxygen Sensor?
If yes which one I need to buy (the front one or the back one), Please provide the part number or some specification to purchase. People are advising me to buy the Denso one.

Can I replace that myself. Do I need to get Under the car for doing that or simply opening the hood will do?
Please let me know your valuable answers.
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi deepak05,

Thank you for the donation.

For O2 sensor replacement, you would need to get under the vehicle to replace it. See diagram for location. The sensors tends to get stuck at times and might strip the threads. Some rust remover sprayed onto the threaded area and allowed to soak would help. Try yo do it with a hot exhaust to avoid it seizing while unloosening.

Before replacement, it would be best to perform diagnostics and since P0135 is present, ohming out the sensor heated circuit would enable you to test if the sensor is faulty. The 2 black wire is the hated circuit and it should have between 1.5 ohms cold and 4.5 to 5 ohms when hot.

The sensor that is faulty is the front one.

OEM is the recommended one and ND is the OEM supplier so should be the preferred choice if you are not going for OEM.
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
DEEPAK05
  • MEMBER
  • 5 POSTS
Hi,

COuld you please give me the diagram to locate the Oxygen sensor?

Inorder to check the sensor, I just need a multi meter correct? I will purchase one and do the check

Deepak
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
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Sorry for the mistake.

I was suppposed to attach a diagram and seem to miss it out after answering the question.


https://www.2carpros.com/forum/automotive_pictures/192750_AFsensor02CRVFig137_2.jpg



If you need further diagnositc procedures, I can get the file for you.
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
DEEPAK05
  • MEMBER
  • 5 POSTS
Thank you so much your help. Please send me those diagnostic procedure file.

After getting the reply from you, I am confident that I can do that.

Could you suggest me a good Multi meter too.

Thanks in advance
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
I have sent the files.

Our parts store do have rather good multitesters. Check them out with the links afer my signature.
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
MPENDERGAST912
  • MEMBER
  • 1 POST
  • 2002 HONDA CRV
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 75,600 MILES
I took my CR-V to auto zone when the engine light lit up to see what the problem was. The codes that he retrieved said that there was a problem with the O2 sensor in the car. I can not seem to locate the sensor or sensors if there are more than one. The Haynes manual I have is a little vague on the location so here I am. Thanks in advance.
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
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Hi mpendergast912,

A = primary O2 sensor.

B = secondary O2 sensor.

C = Catalytic converter.


https://www.2carpros.com/forum/automotive_pictures/192750_O2SensorHonda_1.jpg

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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
KELLY GORANS
  • MEMBER
  • 1 POST
  • 2000 HONDA CRV
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 100,000 MILES
Where is the oxygen sensor #2 located and is there anything I should know b4 replacing it?
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
KHLOW2008
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Hi kelly gorans,

The #2 HO2S is plugged into the rear end of the catalytic converter.

You should check if the catalytic converter and the wiring circuit is ok before replacing the sensor.
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
MOMINER67
  • MEMBER
  • 1 POST
  • 2003 HONDA CRV
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 72,000 MILES
Check engine light had two codes originally, P1166 & P0134. Installed Bosch Universal sensor in Bank1 sensor 1 location which is one closest to engine I think. Reset by disconnecting battery cable. Check engine light went off for few seconds then came back on. Retest showed Check engine light had one code, P0134. Honda dealer thinks their sensors (NKG) have a wider range and dont trip as fast as replacement(Bosch). What do I do next?
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Its an AF sensor and not an o2 sensor
if you are using the universal o2 sensor it would fit but will not do the job
have to order by application

need manual CHECK IT @
https://www.2carpros.com/kpages/auto_repair_manuals.htm
_________________
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
MARBELLA7
  • MEMBER
  • 3 POSTS
  • 2004 HONDA CRV
Electrical problem
2004 Honda CRV Automatic 88000 miles

my question is does anyone know where I could locate my 02 sensor in my 2004 honda crv and when I locate it is it a big job replacing it?
Thank you for your help in the previous questions
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
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Hi marbella7,

The O2 sensor is plugged into the exhaust under just before the catalytic converter.

You need a special tool to remove it and quite often it tends to jam up bad, shearing the threads when removing. A little rust remover before removing is recommended but no guarantee.
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Wednesday, January 16th, 2019 AT 6:38 PM (Merged)
Tiny
SIRJR
  • MEMBER
  • 86 POSTS
  • 2003 HONDA CRV
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 45,000 MILES
The check engine light came on and the OBDII code reader stated the O2 sensor has no activity, code P0134. I found out that the CRV has a front and rear O2 sensor. How do I go about finding out which sensor is the bad one? Thank you!
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Wednesday, January 16th, 2019 AT 6:39 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi sirjr,

Thank you for the donation.

P0134 = bank 1
Bank 1 = Front sensor ie. Before the catalytic converter.

Bank 2 = Rear sensor ie. After the catalytic converter.
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Wednesday, January 16th, 2019 AT 6:39 PM (Merged)
Tiny
BUDDY BENNETT
  • MEMBER
  • 1 POST
  • 2002 HONDA CRV
  • 4 CYL
Replaced #1 02 sensor. Check engine light still comes on code po131 no activity this a 02 crv
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Wednesday, January 16th, 2019 AT 6:39 PM (Merged)
Tiny
SHADETREESPEEDSHOP
  • MEMBER
  • 2 POSTS
I show a P0131 as oxygen sensor low voltage. A low voltage code is different than no activity. Low voltage means the vehicle is running lean (too much air or too little fuel). If the code is actually a low voltage code, then I would look for a vacuum leak, or low fuel pressure.
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Wednesday, January 16th, 2019 AT 6:39 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
That code doesn't even appear to be one that car is programmed for. I would try a different code reader because that code doesn't apply to your car.
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Wednesday, January 16th, 2019 AT 6:39 PM (Merged)

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