Cooling sensor changed! Drained the coolant and took mine out (i used a 17mm wrench but it's probably supposed to be a 16mm) to see the contacts had corroded. The corrosion in the contacts indicates the coolant somehow got into the sensor and possibly shorted it.

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Replaced it with one from Advanced Auto for ~$35 (cuz i needed it quick); I used a 17mm wrench and after intalling it...

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I flushed the radiator, refilled with new coolant (use a 10mm wrench if i you want to remove & dump the contents of the reservoir) and the Check Emission light immediately disappeared. Nice! (Didnt need to reset anything.)
By the way, my Check Emmissions code WAS P0128. Thanks everyone on this forum for their input. Hope my post can help someone too.

If anything goes haywire in the near future, I'll be back to update!