P1119 – IAT Sensor Heater Circuit Low (Ford)

Description

P1119 Ford indicates the IAT heater circuit is reading lower than expected.

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Symptoms

  • Slow warm-up
  • Poor fuel economy
  • Hesitation

Causes

  • Short to ground
  • Failed heater element
  • Wiring issues

Diagnosis

  • Check heater resistance
  • Inspect wiring
  • Measure heater voltage

Repair

  • Replace IAT sensor
  • Repair wiring