Mazda BT-50 P0125: Insufficient Coolant Temp for Closed Loop Fuel Control

P0125 is a generic OBD-II code.  If your Mazda BT-50 has registered it, means that the ECM/PCM is getting a signal from the engine coolant temperature sensor (ECT) that the engine is not warm enough to enter closed loop fuel control.  P0125 is usually caused by a bad thermostat, low coolant, or a bad ECT ... Read more Mazda BT-50 P0125: Insufficient Coolant Temp for Closed Loop Fuel Control