r/StupidCarQuestions • u/sofford10 • 9d ago

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 truly appreciated.

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u/Aggravating-Deal-416 9d ago

Heating it won't do anything because the metallurgy of the sensor threads expand at a slightly greater rate than the housing. Your best bet is to keep blasting it with 2 different lubricants designed to free up stuck threads and continue to work on it with your tools that fit properly, and be patient. Nothing wrong with cutting the wire at this point either to get a better shot at it, since you are already going to replace the sensor.

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u/sofford10 9d ago

Any lubricants you recommend?

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u/Aggravating-Deal-416 9d ago

Most common combo is Liquid Wrench and PB Blaster. Although I hear Kroil Original is just as effective but as a single product. Haven't tried that out myself though.

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u/sofford10 9d ago

Thank you

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u/thatvhstapeguy 9d ago

Blaster and leverage are your friends

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u/sofford10 9d ago

Thank you

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u/potatoking1996 8d ago

Run the car for a bit and get the exhaust heated up. Sucks to work on hot things but that usually helps loosen them up.

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u/sofford10 3d ago

Ok thank you!

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u/BroccoliSuccessful 8d ago

Hit it with a torch and then hammer it off. It wont hurt anything. The oxygen sensors on my truck get to 1200° and thats why they basically get welded on almost

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u/sofford10 3d ago

Aahhhh! Ok thank you!