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 Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Clear Memory Mode>OPERATION , and inspection mode Ref. 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. Ref. to COOLING(EXCEPT FOR STI)>Engine Coolant>REPLACEMENT .
CHECK THERMOSTAT .
Check the thermostat.

Does the thermostat remain opened?

Yes: Replace the thermostat. Ref. to COOLING(EXCEPT FOR STI)>Thermostat .

No: Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Engine Coolant Temperature Sensor .