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P1623 – Immobilizer ID Mismatch

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Symptoms

  • No start
  • Security light

Causes

  • Wrong key
  • ECU replacement
  • Immobilizer fault

Diagnosis

  • Check key ID
  • Scan immobilizer
  • Inspect wiring

Repair

  • Program correct key
  • Repair wiring
  • Replace immobilizer
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