P1524 on 2002 Mazda Millenia

WHAT CAUSES THIS CODE AND What could cause a mis fir p300 code are thy related

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2 answers
air cooler bypass solenoid. no connection to the 300. you need a real diag to get to the bottom of both codes.

Roy
Fault is most likely a bad air charge solinoid,I have not seen this cause a missfire.Call us for an appointment ,We have dealer tooling for Mazda and we can check it for you.