P0521 – Engine Oil Pressure Sensor Range/Performance

Description

The ECM detects an incorrect or implausible signal from the oil pressure sensor.

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Symptoms

  • Oil light on
  • Engine noise
  • Low oil pressure

Causes

  • Faulty oil pressure sensor
  • Low oil level
  • Wiring issues

Diagnosis

  • Monitor oil pressure
  • Inspect wiring
  • Check oil level

Repair

  • Replace sensor
  • Refill oil
  • Repair wiring