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Wow. Congratulations! That looks like an indicator of unburnt fuel, no? If so I guess their could be unburnt fuel in the CAT too? In Cali emissions tests that would be an issue, but I don't know where you are. In any case, aren't deposits like that on a spark plug an indicator of running rich? Do you think just age and time crudded-up the O2 like this, or could there also be another issue, one that could crud-up your new sensor sooner than necessary?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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