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Home >> Infiniti >> 2004 >> Q45 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control System >> DTC P0128: Thermostat Function >> Diagnostic Procedure >> 1. Check Engine Coolant Temperature Sensor
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

1. Check Engine Coolant Temperature Sensor

Refer to COMPONENT INSPECTION  .

OK or NG 

OK: INSPECTION END 

NG: Replace engine coolant temperature sensor.

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