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P1579 – Idle Speed Control Adaptation Fault

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Symptoms

  • Rough idle
  • Stalling

Causes

  • Vacuum leak
  • Dirty throttle body
  • IAC valve issue

Diagnosis

  • Check vacuum lines
  • Inspect throttle body
  • Test IAC valve

Repair

  • Repair leaks
  • Clean throttle body
  • Replace IAC valve
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