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Check threads for damage?
Is tip of sensor running into the bend in the adapter before it can get fully seated?

Your adapter looks just like a device I used on a car that wouldn't get through emissions... it held the O2 far enough out of the stream that my cat trouble code didn't get thrown. Honestly you are better off welding on a full size bung, but maybe it will work I've never tried an adapter before.
 
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