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Are you sure the smoke is white and not blue tinted? Are you having to add coolant ever? Typically a head gasket issue would cause coolant burning all the time, or it could cause combustion gasses in your coolant, or it could cause coolant to mix with your oil. I would do a leakdown test with the radiator cap off, and if you see bubbles/ see the level rise while you compress air into each of the cylinders (at tdc compression) you either have a head gasket problem or a crack.
BTW, what codes are you getting? Your problem really doesn't seem to indicate head gasket issues.
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