As I understand it, the lightweight flywheel caused CEL is a misfire code that usually results from letting the flywheel slow naturally in neutral or with the clutch in, since a LW FW will decelerate more quickly and the ECU doesn't like that.
I'd reset the ECU and if it comes back, get it read. FWIW, my ACT Streetlite flywheel has never caused a CEL.
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Slow and low, that is the tempo.
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