P1123 – Throttle Position Sensor High Input (Ford)

Description

P1123 Ford indicates the TPS signal is higher than expected.

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Symptoms

  • High idle
  • Surging
  • Poor fuel economy

Causes

  • Short to power
  • Faulty sensor
  • PCM driver fault

Diagnosis

  • Check wiring for shorts
  • Test sensor resistance
  • Scan TPS data

Repair

  • Repair wiring
  • Replace sensor