O2 sensor wrench size?

[G8V8]

Hey Charlie, Do you know what size wrench I need to remove the O2 sensors when I switch them over to the magnaflow exhaust?

any reason to not put some penetrating oil like PB Blaster on the threads first?
Thanks,
Ed

[GRRRR8]

7/8 or 22mm. Spray the thread area with Kroil to avoid damaging threads on removal.

[G8V8]

Thanks Charlie!