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Home >> Infiniti >> 2004 >> M45 >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 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 

  1. OK: INSPECTION END 
  2. NG: Replace engine coolant temperature sensor.