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Those are cam timing codes, I doubt it has anything to do with the spark plug.
So doing a google search there are others who have received the same exact set of codes and it was due to a faulty VVTi unit, not necessarily related to the more widespread issue others have had.
I guess I would agree aggressive tuning maybe caused a premature failure, hopefully that's it.
Also for some reason Subaru engines seem to hate Mobil 1.
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