Re:O2 sensor is stuck, do I need to replace it?
 

I had the same problem. Call the auto parts store. They rented me an O2 sensor removal tool for a 15 buck deposit. sprayed a little PB on that bitch and she popped right out.

Re:O2 sensor is stuck, do I need to replace it?
 

my friends broke off in the manifold when he was trying to get it out, so he used the welder and got it red as ----, and hit it and it poped out