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The check engine light refers to the emissions systems, so if there's a problem with the EGR or O2 sensor then it'll cause the CEL to go off. I'm not aware of much else that'll cause it to go off.
Now pistons slamming into plugs.....I have no clue, that's certainly not my department. Anything I would come up with would merely be a guess.....I wouldn't expect O2 or EGR to affect that, but that's a guess.
Good luck!
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