DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control: Notes

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DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

Engine does not return to idle

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Courtesy of SUBARU OF AMERICA, INC.

CHECK ENGINE COOLANT .
Check the following items:
- Amount of engine coolant
- Engine coolant freeze
- Contamination of engine coolant
  Is the check result OK?
  
  Yes : Go to 2.
  
  No : Fill or replace the engine coolant. Ref. to COOLING (H4DO (HEV))>ENGINE COOLANT>REPLACEMENT .
CHECK THERMOSTAT .
Check the thermostat. Ref. to COOLING (H4DO (HEV))>THERMOSTAT>INSPECTION .

Does the thermostat remain opened?

Yes : Replace the thermostat. Ref. to COOLING (H4DO (HEV))>THERMOSTAT .

No : Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>ENGINE COOLANT TEMPERATURE SENSOR .