P1304 – Ignition Coil 4 Primary Fault (Nissan)

Description

The ECM detected a primary circuit fault in ignition coil 4.

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Symptoms

  • Misfire
  • Poor acceleration

Causes

  • Open circuit
  • Coil failure
  • Wiring issue

Diagnosis

  • Check coil resistance
  • Inspect wiring
  • Scan misfire data

Repair

  • Replace coil
  • Repair wiring