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P1420 – Secondary Air Injection Pump Undercurrent

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Symptoms

  • Weak pump operation
  • Emissions failure

Causes

  • Open circuit
  • Damaged wiring
  • Faulty pump

Diagnosis

  • Measure pump current
  • Inspect wiring
  • Check connector

Repair

  • Replace pump
  • Repair wiring
  • Clean connector
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