Re: A/c leak causes o2 sensor failure
The Seafoam could have caused the problem too. It's job is to clean out the combustion tract. Any contamination that it does clean out has to go past the O2's and the cats. Your "spirited" runs could have had adverse effects. The O2's are vented to the atmosphere through the plugs and wire insulation, so this is indeed a possibility that contamination has gotten into the sensor that way. It would be nice if you could get mv readings on all the other O2's also, to see if any others may be contaminated. Keep us posted.
As far as removing the plug/sensor, removing the "Y" pipe is the easiest way to go. Lot fewer cuss words and bashed knuckles.
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