P1394 – Knock Sensor Range/Performance (Nissan)

Description

The ECM detected a knock sensor signal outside the expected range.

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Symptoms

  • Poor acceleration
  • Rattling noise

Causes

  • Sensor failure
  • Wiring issue
  • ECM error

Diagnosis

  • Check sensor resistance
  • Inspect wiring
  • Scan knock data

Repair

  • Replace sensor
  • Repair wiring