Insufficient warm up time; Low engine coolant level; Leaking or stuck open thermostat; Faulty coolant temperature sensor

Read the code and freeze-frame data with an OBD-II scanner; Check the connector and wiring of the part named in the code; Test the part with scanner live data or a multimeter, using the values in the repair manual; Fix the cause, clear the code and test-drive

P0125 on Toyota Corolla E170: Insufficient Coolant Temperature for Closed Loop Fuel Control

Short answer: P0125 means “Insufficient Coolant Temperature for Closed Loop Fuel Control”. The car’s computer has found a fault in the Engine system and turns on the Check engine light (MIL). First check: read the code and freeze-frame data with an OBD-II scanner.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code: P0125
System: Engine
Dashboard light: Check engine light (MIL)
Applies to: Generic OBD-II meaning. Not every code is used by this car.
Confidence: medium (generic OBD-II definition, not checked against the factory manual for this car)
Source: obd-codes.com

Symptoms and when it is set

Check engine light on
You will likely not notice any drivability problems

Likely causes

Insufficient warm up time
Low engine coolant level
Leaking or stuck open thermostat
Faulty coolant temperature sensor

What to check, in order

Read the code and freeze-frame data with an OBD-II scanner
Check the connector and wiring of the part named in the code
Test the part with scanner live data or a multimeter, using the values in the repair manual
Fix the cause, clear the code and test-drive

Related on this car

Same code on other cars

← P0123 P0128 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.