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P1501 – Idle Air Control System Overspeed

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Symptoms

  • High idle
  • Hanging RPM
  • Poor fuel economy

Causes

  • Stuck IAC valve
  • Vacuum leak
  • ECU issue

Diagnosis

  • Check IAC operation
  • Inspect vacuum lines
  • Scan ECU

Repair

  • Replace IAC valve
  • Repair vacuum leaks
  • Update ECU
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