P1251 – Fuel Pump Control Pressure Too High (Nissan)

Description

The ECM detected fuel pressure that is too high.

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Symptoms

  • Rich mixture
  • Poor fuel economy
  • Rough idle

Causes

  • Faulty regulator
  • Restricted return line
  • Stuck injector

Diagnosis

  • Measure fuel pressure
  • Inspect return line
  • Check injectors

Repair

  • Replace regulator
  • Repair return line
  • Replace injector

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