Workshop · diagnostics and repairsWe reply the same day
Diagno.ee
Cooling

P0125 Engine warms up too slowly

By: · Updated:

P0125 means: Engine warms up too slowly. The engine doesn't reach operating temperature in the expected time. OK to drive, but have it checked soon. The repair usually costs about €80–300 in Estonia. The most common cause: thermostat stuck open. Other possible causes: temperature sensor reads wrong, low coolant.

Is it safe to drive?OK to driveOK to drive, but have it checked soon.
Typical repair cost€80–300parts and labour in Estonia

What it means

The engine doesn't reach operating temperature in the expected time. Most often the thermostat is stuck open.

What could be wrong

  1. 1Thermostat stuck open
  2. 2Temperature sensor reads wrong
  3. 3Low coolant

What you can check yourself

Watch whether the temperature gauge rises to its normal position (about 90 °C) while driving. In winter the cabin stays cold. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

  1. We monitor the temperature with a diagnostic tool
  2. We replace the thermostat, and the sensor if needed
  3. We top up and bleed the coolant

Standard SAE description: Insufficient Coolant Temperature for Closed Loop Fuel Control

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

Book a diagnostic check

Questions

What does fault code P0125 mean?

Engine warms up too slowly. The engine doesn't reach operating temperature in the expected time. Most often the thermostat is stuck open.

Can I drive with code P0125?

OK to drive, but have it checked soon.

How much does it cost to fix P0125?

Roughly €80–300 in Estonia. The price depends on exactly what has failed and on the car.

How is P0125 fixed?

We monitor the temperature with a diagnostic tool. We replace the thermostat, and the sensor if needed. We top up and bleed the coolant.

Related codes

P0116Engine temperature sensor reads wrongP0128Engine stays too cold (thermostat)P0217Engine has overheatedP0480Fault in radiator fan control

This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

Book a diagnostic check