Engine Coolant Temperature Sensor 1 Circuit Intermittent/Erratic

Where it lives

For P0119, the sensor sits on the circuit this code reports. The description of P0119 reports a fault at the sensor.

Check these first

• A loose connector at engine coolant temperature sensor 1
• Chafed wiring on the ECT 1 circuit
• A failing engine coolant temperature sensor 1
• Low coolant or air pockets at the sensor
• A thermostat that sticks

What to do next

1. Check the coolant level and bleed air from the system
2. Wiggle test the ECT 1 harness on live data
3. Inspect the ECT 1 wiring and connector
4. Replace engine coolant temperature sensor 1 if erratic
5. Check the thermostat operation
6. Clear the code and retest

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