I'm gonna go and buy a O2 sensor socket, did a search but can't seem to find out if i want 22mm oir 21mm?

this is what you need mate.

http://buy1.snapon.com/catalog/item.asp?search=true&item_ID=74621&PartNo=SWR2&group_id=1448&supersede=&store=snapon-store&tool=all

 

not cheap, but strong enough to do the job.

I have one, if really needed i can post to you, but i will need it back.

Thanks matey, but managed, bought a draper one, strong enough, but wouldn't budge with a big bar due to the angle, and my impact wrench wouldnt budge it, so broke them off, and undid the outer part that screws into the elbow quite easily, put it in the vice, took out what was left of the sensor, and put the bit back on the elbow.... cheers anyway matey...

No worries ..