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P1503 – Idle Air Control System Range/Performance

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Symptoms

  • Rough idle
  • Hesitation
  • Stalling

Causes

  • Faulty IAC valve
  • Wiring issue
  • Carbon buildup

Diagnosis

  • Command IAC valve
  • Inspect wiring
  • Check throttle body

Repair

  • Replace IAC valve
  • Repair wiring
  • Clean throttle body
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