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sounds like the water pump bearing is worn out and has detroyed the water pump shaft seal.
coolant is leaking thru the seal area ,due to the bearing worn out --hence throwing the water pump pulley out of alignment.
The water pump pulley runs of the timing belt.---hence the knocking --either from the pulley or belt chaffing against the timing cover or even throwing the engine timing a few degrees off.
Need to replace water pump and timeing belt and anything else that may be damaged.
That's why, when ever you do a timing belt always do the water pump too.
go to autozone & check the code for free mazda millenia they all have problem with the check engine light problem even though you bought all new parts it will still show , but never replace the cat converter most cause the engine light is the sensor only.
ususlly its something small it also could be that the car has been sitting a while in the car yard you could try disconnecting the battary for 30mns and then reconnecting this some times unscrsmbles the ecu causing the problem good luck
Check engine light usually indicates an oxygen sensor malfunction. The switch is usually installed in the side of the exhaust pipe near the engine. In the winter the wire that is connected to it often breaks off. It is usually a simple fix for a mechanic.