The first thing I would try is some catalyst type penetrating oil. If that doesn't work try applying some heat with a propane torch. When you install the new O2 sensor use some anti-seize on the treads to keep it from happening again.

David Moyer

On 11/30/2010 4:39 PM, Al Gietzen wrote:

After about 130 hrs my O2 sensor seemed to be getting a little sluggish; so I decided to replace it. I put a wrench on it and unable to budge it.  A bigger wrench and still no luck – getting worried about cracking the weld around the bung, or some other damage.  Any ideas about getting that thing loose?

 

I didn’t put anything on the threads when I put it in – perhaps next time; but what?

 

 

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