P1390 – Crankshaft Position Sensor Over-Retarded (Nissan)

Description

The ECM detected an over‑retarded crankshaft timing condition.

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Symptoms

  • Poor acceleration
  • Hesitation

Causes

  • Timing fault
  • Sensor failure
  • Oil flow issue

Diagnosis

  • Check timing
  • Inspect sensor
  • Check oil flow

Repair

  • Correct timing
  • Replace sensor