What size wrench goes on to the stock O2 sensor? I am the mild of a DP install and thats all I have left but I need to buy a stubby wrench to tighten it but I can;t figure out what the size is.
Any help would be great.
Thanks Justus

 

I don't know for sure, but I would guess 17mm. Don't forget some anti-seize for the threads.

 

I think it's alot bigger then 17mm but not sure. Just take a 19mm, 21mm, and 22mm under there with you

 

I think it is a 17mm......... I just did my DP a couple of weeks ago, but I guess my memory isn't what it used to be.

 

Well I am pretty sure its larger than a 19mm but I don't have larger wrenches than that.
Any one sure of the size>??

 

Just run up to your local Autozone or similar store. They should have an O2 sensor socket that should fit (which is what I used).

 

I would use the socket but I have no way to get a ratchet in there that is why I need the stubby open end wrench.
If someone has an o2 socket could you please tell me what size it is??
Thanks again Justus

 

Looks like a 22mm.

I do remember that my stock O2 and replacement where different sizes, but not too far off.

 

Thank you Mahjik after doing more research on the web I found the same answer 22mm.
http://www.scuderiaciriani.com/rx7/O...r_install.html
Thanks Justus

 

so you have the DP off? Why not just install the O2 when the new DP is still out of the car? Then you wouldn't have to use a stubby. Just use a good old cresent wrench

 

No the DP is already installed in the car, I didn't think about installing it beofre I put it in, now I wish I had b/c thats all I have to do is tighten it down.

 

I think it's 22mm. I used a 7/8" crows foot wrench for mine. Worked like a charm.

 

the threaded portion is 18mm so that throws the 17mm crowd out of the equation. . . go with 22mm or vice-grips. hahahaha.

paul

 

Its 23mm.

 

Its 22mm just read the posts I figured it out
I even gave link and bought the wrench.
Thanks for the replies though

 

i just wanted to make sure you knew that the threaded portion was 18mm. . .

paul