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

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

Engine does not return to idle.

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>CLEAR MEMORY MODE>OPERATION , and inspection mode Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>INSPECTION MODE>PROCEDURE ..

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. Refer to COOLING (EXCEPT FOR STI)>ENGINE COOLANT>REPLACEMENT .
CHECK THERMOSTAT.
Check the thermostat. Refer to COOLING (EXCEPT FOR STI)>THERMOSTAT>INSPECTION .

Does the thermostat remain opened?

Yes: Replace the thermostat. Refer to COOLING (EXCEPT FOR STI)>THERMOSTAT .

No: Replace the engine coolant temperature sensor. Refer to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>ENGINE COOLANT TEMPERATURE SENSOR .