well not for anything man, if you go to a harbor freight tools place, they make a tool ive used its a double sided open ended wrench, but it has a swivel head on the actual wrench itself, I know the job takes a couple hours doin it this way, but with that wrench ive used, i got it changed in 15 mins, with no exhaust manifold removing. So if you find the right tool maybe a little pb blaster on the sensor if it dont come out easy, then buy that tool 15 mins - 30 mins your done, best part is not busting up your knuckles changin it, ive yelled out a few cuss words at my old shop i worked for on my day off in the back bay of the shop. haha

heat shield yes it needs to come off, no radiator doesnt have to come off mine came off easy, take off top two pieces holding the radiator down on the support,pull back radiator till you have space, then reinstall em after heat shield is off.
ill see if i can find a pic of the tool

 

http://www.amazon.com/Neiko-Tools-Ox...=cm_cr_pr_pb_t

heres a pic of what it looks like.

 

This thread has helpful information for someone who is preparing to do this fix, and I wanted to add my experience to it.

Mods, If there is a thread for rear O2 sensor installation, please move my post to it.

Today, I replaced the rear O2 sensor on my IX MR that has nearly 98K miles on it. This car spent four years in New England and now almost two years in Southern California. I've been driving with a CEL (code P0420) for at least two years.

1. I bought an OEM rear O2 sensor online, part number 1588A119.
2. I bought a long-handled 22mm open end wrench at a local hardware store for $15. I had a short drive going home, so the cat had heated up.
3. After chocking the rear left wheel, I jacked the passenger side onto two jack stands.
4. Pried open the cable clips, at least the ones that were still intact. Three had bad corrosion and had broken.
5. Found the O2 sensor on the top side of the catalytic converter. Wow. Could there be a worse location for accessibility?
6. Tried to break it loose by hand. No go. The cat was still very warm from driving.
7. Discovered that I couldn't find my can of WD40. I would've bought PB Blaster if I knew beforehand.
8. Tried another open end wrench to lengthen the lever arm. Couldn't get it to work. Didn't have a large enough pipe to use as an extension.
9. My positioning under the car was awkward for using the wrench, so I jacked up the front driver side onto a jack stand. I found that crawling under the driver side was better for me, I'm right-handed.
10. I was determined to get the oxygen sensor off. I found a hefty wooden-handled plastic mallet and hit the end of the wrench a few times (poor man's impact wrench). It finally budged! I unplugged it under the passenger seat and removed it.
11. Installed the new sensor into the cat and routed the wire assembly where the original one had been.
12. Pushed the new plug up through the floor and installed the grommet.
13. Plugged it in, slid the seat forward, and the CEL light and code are gone.
14. It took me 75 minutes this first time, including setup and cleanup, but the next time it would take 45 minutes max.

 

Hi, i planned to change my front 02 sensor (NB02) for my Evo 5 and i noticed that the 02 pic posted by ru4real socket is bigger than my current front 02 socket.

Attached is my front 02 pics which still intact.

My front 02 is with 2 wires (blue & white) and what brand should i opt for (bosch/denso/etc) and which is more economical?

Will a 4 wires 02 sensor fit the front 02?

Thanks

 

Hi anyone to share.

 

I got the O2 socket with a long socket wrench, I got this Loctite® Freeze & Release spray to break away the rust, seize, etc ( recommended by auto store ). My question is, when I open the hood & fit the O2 socket into the oxygen sensor for the front one do I pull it towards me & the radiator direction or back towards the windshield direction to loosen it & uninstall? Someone please answer asap!

 

Protect the radiator with a piece of luan if u can.

 

Will do, but to uninstall the oxygen sensor do I need to drag (pull) towards me & radiators direction?

 

its regular left hand thread, so you need to push towards the motor to loosen it.

 

Next time bring it to me and ill fix it in 2 minutes max. Simple as going in ecuflash, disabling rear o2 sensor, and setting the patch to force pass inspections. Done.

Another thing i dont understand is why you posted about a rear o2 when this thread is full of questions about a front o2 sensor. You probably could have installed a spark plug antifouler and gotten rid of your cel since the rear o2 is for nothing other than emissions. Just disable it set it to pass emissions in ecuflash, and then thats one less sensor to worry about going bad and throwing a cel for nothing.

 

Sorry little confuse when you mean push towards motor to loosen it :S.... Do I pull long ratchet towards me & radiators direction when standing infront of car or push towards windshield, inlet manifold....?

 

righty tighty, lefty loosey. it's a circle so really, you could go either toward the motor on one side or toward the radiator on the other....

 

Trying to replace my upstream oxygen sensor on my 09 stock Ralliart.... the wires coming off the sensor dissapear behind the firewall ???? How do u get the wiring harness unplugged ???

 

hi mates, I didn't want open a new topic but i'm going to replace my front o2 sensor on evo9.
the problem is that i can't rotate the wrench forwards to engine because before to have the possibility to unscrew the wrench touch the exahust manifold .
the o2 housing isn't the oem so i suppose the o2 sensor is screw on it on a unlucky matching position.
can somebody advise me if is possible do something without remove exhaust and radiator?

 

i did the job using an impact socket+swivel branch.this tool was useless in my case.