What does P0119 mean?
The engine coolant temperature (ECT) sensor tells the computer how hot the engine is. It affects fuel mixture, idle speed, cooling fans and, on many cars, the temperature gauge.
The temperature signal is dropping out or jumping for short periods.
Codes are a starting point. They tell you which test failed, not which part to replace. Check for other stored codes and fix those in a sensible order.
Symptoms
- Check engine light
- Hard starting
- Cooling fans running all the time (a common fail-safe)
- Poor fuel economy
- Wrong temperature gauge reading on some vehicles
Common causes
- Loose connector
- Chafed wire
- Sensor failing intermittently
How to diagnose P0119
- Wiggle-test the harness while watching live data.
- Look for corrosion in the connector.
- Check the coolant level first (only when the engine is cold).
- Compare ECT with intake air temperature after an overnight cold soak.
How to fix it
- Top up or bleed the cooling system
- Repair wiring
- Replace the ECT sensor
Estimated repair cost
Likely repairs for P0119 run from about $80 to $250, depending on the cause.
| Repair | Typical range (parts + labor) |
|---|---|
| Diagnostic fee (scan + testing) | $100 - $200 |
| Coolant temperature sensor | $80 - $250 |
These are rough US estimates for an independent shop in 2026, based on typical parts prices and standard labor times. Dealers, big trucks, luxury brands and high-cost areas often run higher. They are not quotes. Use the repair cost estimator to adjust for your vehicle.
How serious is P0119?
Moderate severity
Usually drivable, but keep an eye on the real engine temperature. If it is overheating, stop.
P0119 FAQ
What does P0119 mean?
P0119 stands for "Engine Coolant Temperature Sensor 1 Circuit Intermittent". The engine coolant temperature (ECT) sensor tells the computer how hot the engine is.
Can I drive with a P0119 code?
Usually drivable, but keep an eye on the real engine temperature. If it is overheating, stop.
How much does it cost to fix P0119?
It depends on the cause. The likely repairs for P0119 range from about $80 to $250 at an independent shop in the US, plus a diagnostic fee of roughly $100-$200. These are rough estimates; dealer prices and some vehicles run higher.
What is the most common cause of P0119?
The most common causes are: loose connector; chafed wire; sensor failing intermittently.