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P0191 Diagnostic Trouble Code Discussion for August 2011

Fuel Rail Pressure Sensor Performance

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Trouble Ticket Help Requests for DTC P0191
Help Request Posted
2007 Ford E-350 Super Duty 5.4L No Start, Poor Idle Quality, Stall, MIL Lamp on VIN: 1FDSE35L07
P0191: fuel pressure performance. This E350 began as a CEL hard/no start. Found fuel pump was noisy and had low pressure replaced it. Truck still wouldn't start, grounded pump to chassis get 75psi. Repalced fuel pump driver still the same. Ohmed wires from fuel pump to driver on power and grou...
August 17, 2011
2007 Mercedes-Benz CLK63 AMG 6.3L MIL Lamp on VIN: WDBTK77G87
P0191: Fuel Rail Pressure Sensor Circuit Range/Performance. Cannot find any info or repair diagnosis on this fault. Found wiring diagram and verified good 5v reference and good ground. Third wire is signal and cannot scope at this time. Fuel pressure is 53-52 psi at idle. Cannot find spec in Alldata or Mitchell. Vehi...
August 19, 2011