DTC P0191: Fuel Rail Pressure Sensor Circuit Range/Performance Bank 1: Notes

1. -

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

Improper idling
Poor driving performance

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Refer to ENGINE (Diagnostics) (H4DO)>Basic Diagnostic Procedure>PROCEDURE .

CHECK DATA MONITOR .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor or a general scan tool, perform the clear memory of [Engine]. Refer to COMMON (DIAG)>CLEAR MEMORY .
3. Turn the ignition switch to OFF.
4. Start the engine.
5. Using the Subaru Select Monitor, read the values in [Fuel Rail Pressure A] and [Fuel Rail Pressure B].
  NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Refer to COMMON (DIAG)>DATA MONITOR .
Is the difference of the values between [Fuel Rail Pressure A] and [Fuel Rail Pressure B] 2343 [kPa] (17577 mmHg, 692 inHg) or more?

Yes : Replace the fuel pressure sensor. Refer to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Pressure Sensor .

No : Refer to "Check non-permanent occurrence malfunctions". Refer to ENGINE (Diagnostics) (H4DO)>General Description>INSPECTION>CHECK NON-PERMANENT OCCURRENCE MALFUNCTIONS .