For Shop Owners

P0125 TOYOTA - Insufficient Coolant Temperature for Closed Loop Fuel Control

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3 What does this mean?

Possible causes

  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
What does this mean?

Tech notes

SPECIAL NOTE: For some Toyota models, the P0125 codes is set by the front O2 sensor.

There are factory service bulletins for the following Toyota models:
2003 Toyota Corolla
2003 Toyota Matrix
The service bulletin recommends replacing the O2 sensors to fix the problem.

2004-2007 Toyota Prius

What does this mean?

When is the code detected?

The Engine Control Module (ECM) monitors the ECT signal voltage after engine start-up. If, after sufficient time has passed, the sensor still reports that the engine is not warm enough for closed-loop fuel control, the ECM interprets this as a fault in the sensor or cooling system and sets a Detected Trouble Code (DTC).
The ECT is 0C (32F) at engine start. After 5 minutes running time, the ECT sensor still indicates that the engine is not warm enough to begin active feedback control of the air-fuel ratio. The ECM interprets this as a fault in the sensor or cooling system and sets a DTC.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0125 TOYOTA Description

The Engine Coolant Temperature (ECT) sensor is used to monitor the temperature of the engine coolant. The resistance of the sensor varies with the actual coolant temperature. The Engine Control Module (ECM) applies a voltage to the sensor and the varying resistance of the sensor causes the signal voltage to vary.
OBDII Code P0125 Toyota - Insufficient Coolant Temperature for Closed Loop Fuel Control -

P0125 TOYOTA Information for specific Toyota models

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P0125 TOYOTA Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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