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P1422 – Secondary Air Injection System Flow Malfunction (Warm Engine)

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Symptoms

  • Emissions failure
  • Rough idle

Causes

  • Blocked passages
  • Faulty pump
  • Valve malfunction

Diagnosis

  • Command air pump
  • Inspect valves
  • Check hoses

Repair

  • Replace pump
  • Repair hoses
  • Clean passages
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