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) (H4DOTC)>Basic Diagnostic Procedure>PROCEDURE .

CHECK ENGINE COOLANT .
Check the engine coolant. Ref. to COOLING (H4DOTC)>ENGINE COOLANT .

Is the check result OK?

Yes : Go to 2.

No : Fill or replace the engine coolant. Ref. to COOLING (H4DOTC)>Engine Coolant>REPLACEMENT .
CHECK THERMOSTAT .
Check the thermostat. Ref. to COOLING (H4DOTC)>Thermostat>INSPECTION .

Does the thermostat remain opened?

Yes : Replace the thermostat. Ref. to COOLING (H4DOTC)>THERMOSTAT .

No : Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE COOLANT TEMPERATURE SENSOR .