P0191 Fuel Rail Pressure Sensor Performance

fault code P0191 Fuel Rail Pressure Sensor Performance is set in the engine control module.When engine control module detect wrong signal from fuel rail pressure sensor. the fuel rail pressure sensor is responsible for telling the actual amount of fuel pressure present in the fuel rail to engine control module. fault code P0191 Fuel Rail Pressure Sensor Performance will also store when fuel rail sensor get fail.

If fuel rail pressure sensor monitor low amount of fuel pressure in fuel rail it will cause the engine to not start. failure of fuel rail sensor can also cause this fault code and illuminate the engine light on cluster meter.A bad fuel rail sensor can lead to high pressure pump work more as it feel low pressure in the system. fuel rail pressure sensor monitor and make sure the constant level of fuel amount in the fuel rail. if it goes bad the flow and amount of fuel will remain at low in fuel rail pressure which will cause the engine to not start.

Cause of P0191 Fuel Rail Pressure Sensor Performance :

  • faulty fuel rail pressure sensor.
  • damage wiring harness of the sensor.
  • low amount of fuel in the fuel rail.
  • faulty low pressure fuel pump can also cause this fault code.

Symptoms :

  • engine light will illuminate on cluster meter.
  • it take long crank to start the engine.
  • engine will not start.

Solution P0191 Fuel Rail Pressure Sensor :

  • Replace faulty fuel rail pressure sensor.
  • check and replace the low pressure fuel pump.
  • Repair mechanical failure of high pressure pump.
  • repair damage wiring harness.
  • Fill the fuel tank at optimum level.

How to solve P0191 :

  • Fill the low level of fuel in fuel tank to its optimum level.
  • Check the pressure of fuel after fuel filter it should reach to its specified value.
  • Check the fuel pressure after high pressure pump. If pressure does not reach to specified value. Then repair or replace high pressure fuel pump.
  • Check for the failure of pressure regulator sensor by scane tool. If its is ok then go for fuel rail pressure sensor signal. A faulty fuel rail pressure sensor should change with new one to solve the problem.

Special note :

Fuel rail pressure sensor monitor the amount of fuel comes from the low pressure fuel pump. failure of the fuel rail pressure sensor can cause the engine to not start .sometime other electrical problem also can cause this fault code to store in the engine control module.

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