2003 Disco 2 158,000 miles

I have been trying to get this darn o2 off for 2 days now... tried PB blaster, heat so hot I could barely be under the truck and the wd-40 rust penetrating spray... I have the special o2 knock tool (the one you either hit with a hammer or put in a 3/8 in drive socket extension in... It's not budging.
Any advice or tricks would be great.

For those who still don't know which sensor I'm talking about it's the Passenger side upstream sensor (it's the name of the thread)

 

they can be a bitch, heat doesn't really work because they have been heated and cooled a thousand time. i had luck heating the trucks up spray them with SeaFoam DEEP CREEP, then going after them. If you are using a standard o2 socket they can be a bear a lot of times it will only budg the sensor a hear and you have to keep resetting the socket.
are you using one of these: if so you need a bigger ratchet

 

I'll try a set up like that, I was just underneath hitting the socket you have in the picture with a 2 lb. hammer trying to break it loose. I may have more luck with a set up like you show in the picture!

 

Drowssap, You sir, are a lifesaver. I used your setup and got it done within 20 minutes. Replaced it, cleared the codes and went for a drive.. Came back and rescanned and the code is gone gone gone. Hopefully I will see an increase in MPGs thanks man for all your help!

 

no Thank you sir