Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Did you use oxygen sensor removal socket?
You just need to give it more torque, you won't break anything. What I've done is use the oxygen sensor socket, ,then use a regular socket on top of the oxygen sensor socket so you can get at it from a good angle. Then use a pipe as a extension on the socket wrench for more leverage. Let me know how it goes or if you run into more questions. You can reply to this answer at any time without opening new questions, thanks.
Spray it down with some penetrating oil and let it sit over night then try again in the morning maybe with a longer pipe of needed. Let me know how it goes, thanks.
If you have a torch I'd heat it up. Or if you know someone who has a torch drive to their house and do it. Let me know how it goes, thanks.