It's not just the socket size that's important with the O2
sensor wrench. It's that it has a piece of it cut out so the
sensor's wiring won't be disturbed when torquing the sensor
into place.

Autozone loans O2 sensor wrenches out (for a deposit,
returned upon return of the tool).

"Ryan Biggs" <rrbiggs@swbell.net> wrote
> Hi guys,
>
> Thanks for the group's input on ball joint issues. The
> tool store that
> will be helping me with that also has something else I'll
> need: an
> oxygen sensor socket. As best as I can guess without
> having a socket
> that can get to it, it looks like a standard 7/8" (22mm).
> Does this
> sound right?
>
> Thanks again for the help. Now that I know about the FAQ,
> I have many
> fewer unanswered stupid questions!
>
> -R