I JUST remembered that when I moved the coil to cylinder #2, I did not swap out the spark plug connector attached to it. I just ran out and swapped the plug connector back to cylinder #6, but unfortunately after clearing the codes and getting a "check engine" light again, P0302 reappeared. I think that rules out the plug connector and points to a bad coil. I still can't figure out why I don't also get a P0301. Does that code maybe not exist for this car?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280