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well the fact that there's a difference in exhaust 'levels'/'mixture richness' based on "waiting" or "not waiting" implies that it might be beneficial to wait, regardless of exhaust leak or not.
the fact that it throws a CEL tells me that there's different exhaust behavior if I don't wait for the air pump to do its thing. so i'm wondering if that "non-wait" behavior is harmful to the overall health of the engine/vehicle.
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