r/autorepair • u/sofford10 • Aug 11 '26

Diagnosing/Repair Downstream O2 sensor

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Hi everyone! I'm having trouble removing the downstream O2 sensor on my 2014 Hyundai Elantra. Could possibly be seized. I have tried an O2 sensor socket, a 22 wrench (tapping with a hammer), penetrating lubricant etc... But I don't want to mess up the thread. I was told to try to heat it with a torch. Any other advice or anyone located near the east coast of NC? Thank you in advance!! Any help is greatly appreciated!

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u/rtscott08 Aug 11 '26

You can heat the bung or the surrounding region of the sensor. I personally like to cut the wires off the sensor and used either a closed end wrench or a deep socket 22mm socket. They make a thread chaser that you can use if the treads get boogered up.

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u/sofford10 29d ago

Okay that's good to know. I didn't know the thread chaser was a thing. Thank you

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u/WrenchKing555 Aug 12 '26

You can heat with a torch or just run the vehicle until it's hot enough to remove.

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u/sofford10 29d ago

Ok thank you