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Running the checks on this list while attempting to root out a misfire. The normal operations test swings wide (28-60) and the test with the o2 sensor grounded consistently reads 49 instead of 87. I've redone it multiple times, even with a female connector on one end of the ground wire and a clip on the other to make sure it's actually attached, grounding it to the hook on the engine on the left side and to the exhaust, and I always get the same result. All of the other checks were within range.

I asked Dave S. about it and he didn't even think that reading should be possible unless there's some weird electrical issue. Has anybody ever seen this before?