How to fix p0115 on a mercury cougar

Question

How to fix DTC p0115 on my 2000 mercury cougar 2.5 V6?

Answer 1

The engine cooling system either is low on coolant which can mean there is a leak somewhere, the thermostat is either staying open or not closing, the coolant temperature sensor maybe bad or there is a water pump issue. 

Possible causes:

- Low engine coolant level
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor circuit poor electrical connection
- Water pump issue