P1248 – Turbocharger Boost Sensor High Input (Nissan)

Description

The ECM detected a high input signal from the turbo boost sensor.

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Symptoms

  • Overboost
  • Limp mode
  • Poor drivability

Causes

  • Short to power
  • Faulty sensor
  • Wastegate issue

Diagnosis

  • Check boost pressure
  • Inspect wiring
  • Test wastegate

Repair

  • Repair wiring
  • Replace sensor
  • Fix wastegate

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