This code typically appears in Mazda’s when the coolant temperature between ECT sensor 1 & 2 deviate to far from each other. This code typically appears during the winter time, if you follow all the procedures and you notice that your heat does not work the final solution is that you may need a new heater core
Thermostat Part #- Duralast 15048
Radiator Cap part #-Duralast 7916
Thermostat housing part #- Duralast 902-5198
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