I had one of the "OEM" brand black O2 sensor sockets for many years. When I tried to take out my crispy 12 year old factory original sensors they would not budge. The socket has 5 sides and has a notch to clear the wire. When I put the 1/2" breaker bar on it the socket just expanded and slipped. I blew off the project till I could get to a buddys shop to torch them off
When I was at NAPA for a wiper motor I saw a NAPA brand sensor socket, it had a much smaller notch than my old socket and was like $15 so figured WTF try it. That sucker was able to break off both my sensors, of course they were stuck in the socket pretty good afterwards but it did the job and I was able to get my inspection sticker!!
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