Quote:
Originally Posted by Russell James
Heat is the key.
The service manual says to break the O2s loose right after running the engine. That works the best.
If the pipes have already cooled down, take a small propane torch and heat up the O2 bung.
If the exhaust pipe/bung isn't hot, it will often rip the threads right off the sensor. Which is happening if it stops turning after starting to turn.
Spray stuff might help a bit, but hot exhaust pipes is much more important. Kind of like an oil filter. On a cold engine, the filter can be locked on there with a death grip. Get the engine hot, and the filter will come right off easy.
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Not saying everyone else who is telling you to use PBB and Liquid wrench is wrong, but Heat by far is the easiest way to get your 02's loose.