P0119 - Engine Coolant Temperature Sensor 1 Circuit Intermittent
Engine Coolant Temperature is monitored to allow the ECM to accurately adjust fueling and emission control systems, it will also normally be used to control cooling fan operation
Fault Code Explained
The sensor output signal may be intermittently going in and out of it’s normal operating parameters or changing at a rate that is not consistent with the current engine operating conditions.
If possible use a diagnostic computer to view live data readings for the sensor and compare to actual coolant temperature. Test sensor supply Voltage and output signal