P1291 – Intake Manifold Pressure Sensor High Input (Nissan)

Description

The ECM detected a high input signal from the intake manifold pressure sensor.

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Symptoms

  • Rough idle
  • Poor drivability

Causes

  • Short to power
  • Faulty sensor
  • ECM issue

Diagnosis

  • Check wiring for shorts
  • Inspect sensor
  • Scan live data

Repair

  • Repair wiring
  • Replace sensor