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Update: I replaced the upper o2 sensor this morning and both codes (0420 and 1164) did not come back in the 4 mile commute. The old o2 sensor was black with soot. It was replaced with a used but confirmed-good Insight sensor from a salve (thanks Brent Springer). Not only did this chase the codes away (for the morning's commute), but my engine idle is now 200 rmp's lower, hovering now around 950 where before, 1150. Can't speak for the sulfur smell, but I believe progress has been made.
Question: could the blackened o2 sensor be an indicator of worn spark plugs? I do notice uneven acceleration/power that could almost be described as hesitation at low rpms. I've not checked the plugs, but they say 105k (or 7 years) is the time to replace them. I'm 3 years and 5k miles due.
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