P1115 – Engine Coolant Temperature Sensor Intermittent (Ford)

Description

P1115 Ford indicates intermittent operation of the engine coolant temperature sensor.

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Symptoms

  • Poor fuel economy
  • Slow warm-up
  • Rough idle

Causes

  • Loose connector
  • Broken wiring
  • Failing sensor

Diagnosis

  • Wiggle-test wiring
  • Check connector tension
  • Measure ECT voltage

Repair

  • Repair wiring
  • Replace ECT sensor