P1121 – Throttle Position Sensor Intermittent (Ford)

Description

P1121 Ford indicates intermittent operation of the throttle position sensor.

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Symptoms

  • Intermittent hesitation
  • Surging
  • Poor acceleration

Causes

  • Loose connector
  • Broken wiring
  • Failing sensor

Diagnosis

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

Repair

  • Repair wiring
  • Replace TPS sensor