Our website family:  ClubCivic.com - ClubIntegra.com - TunerSports.com

SEARCH: Forums | Parts
Attention Honda Civic Visitor:  Remove this block by logging in above or registering.

Welcome to ClubCivic.com, a forum dedicated to the Honda Civic, including all generations. In order to post on this forum you will have to register.

Registration is free and will intitle you to other site features including access to post your Honda Civic in the member's garage, join in raffles for performance parts, etc.



Go Back   ClubCivic.com - Honda Civic Forum > Honda Civic DIY / How To > DIY How To's > Engine Tech / Drivetrain DIY How-To's

Notices

Please SEARCH Before Posting a New Thread. ->
Ready to Post a New Thread/Question? ->



How To: 98 EX secondary O2 sensor replacement

Engine Tech / Drivetrain DIY How-To's




Reply
 
Thread Tools
Old 01-08-2010, 01:48 PM   #1
J-Sap
Registered User
 
Join Date: Jan 2008
Location: Stowaway
Posts: 16
 
Thanks: 0
Thanked 0 Times in 0 Posts

Default How To: 98 EX secondary O2 sensor replacement

I have a 98" Civic EX and I have the error code P0138 coming up. I am fairly certain that the oxygen sensor is gone (it has almost 82,000 miles on the original sensor). I did not change anything else on the car and have not for several months when this came on. I purchased a replacement oxygen sensor for it that will bolt right on.

I put the car on ramps and looked under the car and see that the second O2 sensor is on top of the exhaust behind the cat with very little space to get it off. I can not get my normal oxygen sensor drive socket on because there is no room and also have trouble getting a flare nut wrench on it because of the position.

My question is how do you get this sensor off the car and how have other people done it???

It looks like I could undo the cat from the exhaust on one side to give me more room or fully take it off but it is rusted a good amount and would rather not risk have to replace all of those parts.

Any help would be greatly appreciated.
J-Sap is offline   Reply With Quote
Old 01-08-2010, 01:52 PM   #2
RonJ
Civic minded
 
RonJ's Avatar
 
Join Date: Oct 2007
Location: Houston, TX
Posts: 12,467
 


Thanks: 0
Thanked 69 Times in 64 Posts

Default

If you clear the ECU, does the code return?

It may be easier to just remove the cat to replace the sensor.
__________________
Don't guess, troubleshoot
-Manuals: site 1 and site 2; -Spark; -Fuses; -Pull 92-00 CEL codes; -Fuse 15 TSB; -Clean IACV or FITV
Please do not PM me tech questions.
RonJ is offline   Reply With Quote
Old 01-08-2010, 02:18 PM   #3
J-Sap
Registered User
 
Join Date: Jan 2008
Location: Stowaway
Posts: 16
 
Thanks: 0
Thanked 0 Times in 0 Posts

Default

Quote:
Originally Posted by RonJ View Post
If you clear the ECU, does the code return?

It may be easier to just remove the cat to replace the sensor.
Yes I can clear the ECU and the code comes back after a couple minutes.
J-Sap is offline   Reply With Quote
Old 01-08-2010, 05:04 PM   #4
RonJ
Civic minded
 
RonJ's Avatar
 
Join Date: Oct 2007
Location: Houston, TX
Posts: 12,467
 


Thanks: 0
Thanked 69 Times in 64 Posts

Default

The O2 sensor is probably the problem, but be aware that there is some possibility that the cause could be a bad wire or less commonly a bad ECU.


__________________
Don't guess, troubleshoot
-Manuals: site 1 and site 2; -Spark; -Fuses; -Pull 92-00 CEL codes; -Fuse 15 TSB; -Clean IACV or FITV
Please do not PM me tech questions.
RonJ is offline   Reply With Quote
Old 01-08-2010, 10:01 PM   #5
J-Sap
Registered User
 
Join Date: Jan 2008
Location: Stowaway
Posts: 16
 
Thanks: 0
Thanked 0 Times in 0 Posts

Default

Thank you for the help RonJ.

I ordered a crow foot socket that I should be able to get over the O2 sensor and get it off. I will post pics and update how it goes.
J-Sap is offline   Reply With Quote
Old 01-14-2010, 10:42 PM   #6
J-Sap
Registered User
 
Join Date: Jan 2008
Location: Stowaway
Posts: 16
 
Thanks: 0
Thanked 0 Times in 0 Posts

Default

Alright so I got my O2 sensor replaced. I can honestly say that on all the cars I have worked this Honda Civic was by far the hardest vehicle to perform a basic maintenance task on. I also documented it with pictures and figured I would do a quick write up.

1. I drove the front of the car up onto ramps, put two jack stands under the car for safety, and blocked one of the back tires.
2. Disconnect the battery. This is for safety and to reset the ECU.
3. The O2 sensor is located under the car directly underneath the center console. It is easiest to get at from the passenger side.


4. Depending on how much rust there on the sensor determines how much effort is needed to get the O2 sensor off. The safest and easiest way to get the O2 sensor off is to run the car for a minute or two in order to heat the catalytic converter up. This causes the metal to expand and should make it easier to pull the O2 sensor off. I was not lucky enough for this to work, I then tried a spray to loosen the bolt (failed as well). The final resort and what worked for me was an acetylene torch. Caution that this could damage the catalytic converter because it so close to the O2 sensor but if used fast and only on the area that needs it you will be fine. I also needed a special O2 sensor removal tool because of the clearance underneath the car I could not get a traditional O2 socket wrench on the old sensor or install the new sensor with it. It is a crows foot socket wrench that I ordered on amazon. It worked great for removal and installation.


5. Once the sensor is out of the socket you will need to un-clip it in the car, the clip is located in the center console. In order to get to it you will need to remove the black box at the bottom. This is done with a screwdriver and one screw on the passenger side and driver side. Once the screws are out the plastic clip in that the screw went into will need to be removed (they just pop out) and then use a flat headed screwdriver to separate the two halfs of it apart.




6. Once it is apart the O2 sensor plug is located on the passenger side underneath the rug (I had to cut the rug a little to get at it). This comes undone by hand.


7. There is a plastic washer that goes into around the O2 sensor wire that also needs to be pulled out and replaced. I recommend just getting a new washer from a hardware store because I was unable to slip the stock one around either side of the O2 sensor.

8. Now install the new O2 sensor into the cat and run the wire through the hole in the firewall into the clip to connect it to the car. Don't forget to use some type of never seize on the O2 sensor threads so it can be removed again. A light layer on the threads is all you will need and don't get any on the sensor or it may be damaged.

9. Installation of everything is the reverse of taking it apart, once it is all set hook the battery back up and put the car on the ground. You should have a new O2 sensor fully functional in the car.

I put around 20 miles on the car today after doing this and have had no ECU or check engine light come up. Also my temp gauge is slightly lower then what is used to be, so I am hoping that I will get better gas mileage in the future.
J-Sap is offline   Reply With Quote
Old 01-14-2010, 10:44 PM   #7
Esotericimage
Try GOOGLE 1st
 
Join Date: May 2008
Location: 305
Posts: 2,375
 
Thanks: 0
Thanked 0 Times in 0 Posts

Default

nice write up..
Esotericimage is offline   Reply With Quote
Old 01-22-2010, 01:58 PM   #8
J-Sap
Registered User
 
Join Date: Jan 2008
Location: Stowaway
Posts: 16
 
Thanks: 0
Thanked 0 Times in 0 Posts

Default

Quick update. The car runs great and went for a 400 mile commute earlier in the week. The gas milage inceased from 30 mpg to 36mpg, a very nice 20% improvement. Also the engine temp was noticably cooler and lower the entire drive.
J-Sap is offline   Reply With Quote
Old 01-05-2011, 03:11 AM   #9
ej4sedan
Registered User
 
Join Date: Nov 2010
Location: san jose
Posts: 4
 
Thanks: 0
Thanked 0 Times in 0 Posts

Default

thanks for the write up.
__________________
"nobody can go back and start a new beginning, but anyone can start today and make a new begining"
ej4sedan is offline   Reply With Quote
Old 01-04-2012, 12:55 PM   #10
cpgoose
Registered User
 
Join Date: Jan 2012
Location: US
Posts: 1
 
Thanks: 0
Thanked 0 Times in 0 Posts

Default

Hey guys...I just found this thread while I was searching around for help on replacing my O2 sensor. I'm trying to replace the same one as in this thread (the one by the cat), but I'm having a terrible time removing it due to rust on the sensor and on the cat. I even brought the car to Sears to have 2 tires replaced and asked them to do the sensor while they were there. When I came back to get the car they said they couldn't remove it and didn't want to hurt anything else, so they left it there.

Hey J-Sap, were you able to get pictures of what you did like you mentioned?
cpgoose is offline   Reply With Quote
Old 01-04-2012, 02:29 PM   #11
Jersey8
B20: Detroit Muscle!
 
Jersey8's Avatar
 
Join Date: Mar 2006
Location: MI
Age: 27
Posts: 4,670
 

Thanks: 0
Thanked 0 Times in 0 Posts

Default

try pb blaster, maybe a torch, maybe a 7/8" open end wrench instead of a socket (moar torque!)?

you may need to remove the exhaust in order to get a betting footing...
__________________
Jersey8 is offline   Reply With Quote

Reply


Bookmarks


Similar Threads
Thread Thread Starter Forum Replies Last Post
Secondary O2 sensor connector location? cmaylo Tech Archive (No Posting) 6 07-31-2009 04:01 PM
FS: 96-00 Civic EX Cat Converter + Secondary OEM O2 Sensor chunktwo Parts for Sale 31 05-11-2009 10:11 PM
wtb 96-00 civic secondary 02 sensor 4cedfedEK Parts Wanted 3 07-10-2008 03:38 PM
Code 65: Secondary Oxygen Sensor heater mik Tech Archive (No Posting) 0 01-21-2005 07:01 PM
Bosch Secondary O2 Sensor ebbs306 Show off your 6th Generation Honda Civic (1996-2000) 6 11-21-2003 02:45 AM

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 06:19 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
vB.Sponsors

Store News:

Latest Topics:


Store Specials:

ALL
Unanswered Topics:





Copyright 2011 ClubCivic.com - ClubCivic.com is in no way affiliated with Honda Motor Company