any magic tricks for removing O2 sensors?

[Vizzy]

Don't forget to try and tighten FIRST, then loosen. Sometimes breaking the threads loose can be helped along by this. It certainly isn't intuitive but it often does help break them free!

 

[JustinH]

I have had no problem using a cheater bar on a box wrench.

 

[gtx510]

http://www.google.com/search?q=o2+sensor+wrench
http://www.google.com/search?q=o2+sensor+socket

Kroil > PB Blaster

failing that

 

[Cutehumor]

I used hot candle wax to remove a stuck oxygen sensor.