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Q: replacing oxygen sensor on 2006 Kia Spectra

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Should the engine be hot or cold ? I have heard mixed reviews.... The sensor is located in an easy place to get at and I am considering doing this myself. Any tips appreciated. Thank you.
(2) Answers
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I like to remove them hot, I try to get paraffin wax to wick down the threads of the sensor as I try to take out the sensor, works great. Make sure you don't strip the threads and are patient taking out the sensor!
I always thought warm was better than cold, not hot, but warm. A little heat seams to allow the threads to break loose easier.