Rusted o2sensore tube

[stockrocks]

So i bought a used exhaust system just for the meanwhile until I get a really nice one lateeeeer on. I am having a hard a** time
removing the fastener that holds the o2 sensor tube to the exhaust. the previous owner just cut the the tubing to quickly get the old exhaust off to put in his new one. whats the best way to take it off? my tubing is fine and came out waaaay easier and it was rusted too
which is ready to go in where the other one i bought is stuck on.



on the right was my old one, came off that somewhat easy, the one on the left is the one that was cut to just completely skip the troubles of
having to try get it off, but in my case I need to get it off any suggestions?

This is it close up...

[346ci]

You could try heating it with a torch or one of those small propane torches from lowes, home depot, etc. You could also weld a old junk wrench to it and try backing it out.

[Q451990]

Have you tried soaking it overnight in WD-40, PB Blaster, or Liquid Wrench?

Heath