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P1629 – Immobilizer Engine Start Blocked

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Symptoms

  • No start
  • Security warning

Causes

  • Invalid key
  • Immobilizer fault
  • Antenna ring issue

Diagnosis

  • Check key ID
  • Inspect antenna ring
  • Scan immobilizer

Repair

  • Program key
  • Replace antenna ring
  • Repair immobilizer
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