: Damaged, corroded, or loose wiring and connectors are frequent culprits for "intermittent" codes.
: The sensor itself may be defective or worn out. P 0119 mpg
The diagnostic trouble code indicates that your vehicle's computer has detected an intermittent or erratic signal from the Engine Coolant Temperature (ECT) sensor. This means the sensor is sending irregular voltage readings, causing the computer to lose track of whether the engine is hot or cold. Impact on MPG and Performance : Damaged, corroded, or loose wiring and connectors