P0191 on BMW
Fuel Rail Pressure Sensor Circuit Range/Performance
P0191 on BMW vehicles indicates fuel rail pressure sensor circuit range/performance. Au7o has documented this code across 3 BMW models — most commonly on 3 Series, 5 Series, M340i. This code sets when the fuel rail pressure sensor's signal is out of its expected range or doesn't match what the computer expects for current conditions. On direct-injection and many modern engines, this sensor reports fuel pressure in the rail so the computer can precisely control fueling and the fuel pump. When the reading is implausible — too steady, erratic, or inconsistent with commanded pressure — this code is set, sometimes with hard starting, hesitation, or reduced power. It generally points to the sensor or its wiring, though an actual fuel-pressure problem can also trigger it. Typical repair costs on BMW range from $500 to $1,500, depending on the specific model and root cause.
Common Causes of P0191
- •Faulty fuel rail pressure sensor
- •Corroded, loose, or damaged sensor connector
- •Open, shorted, or high-resistance sensor wiring
- •Actual fuel pressure out of range (weak pump or regulator)
- •Restricted fuel filter or supply line
- •Loss of reference voltage or ground from the ECM/PCM
- •Faulty fuel pressure regulator or control valve
P0191 on BMW by Model
BMW 3 Series(1 issue)
- High Pressure Fuel Pump (HPFP) Failure2007-2010
The N54 twin-turbo engine's high pressure fuel pump can fail, causing long cranking, rough idle, and power loss. BMW extended warranty coverage and released updated pump designs.
BMW 5 Series(1 issue)
- N54 High Pressure Fuel Pump (HPFP) Failure (Safety Critical)2008-2012
The N54 twin-turbo engine's high pressure fuel pump fails prematurely, causing sudden engine stalling, long cranking, and dangerous power loss while driving. BMW used defective HPFP designs with faulty internal roller tappets that wear out by 50,000-80,000 miles. Pump failure leaves car stranded and creates safety hazard when engine dies on highway. BMW extended warranty coverage to 10 years/120,000 miles after NHTSA complaints exceeded 987 reports. This is THE most common N54 failure. Updated revision pumps (part numbers ending in higher letters like "F" or "G") are more reliable. Affects E60 535i (2008-2010) and F10 535i (2011-2012 early). Bimmerpost ranks HPFP as #1 N54 problem - failure rate near 60% on original pumps.
BMW M340i(1 issue)
- High-Pressure Fuel Pump (HPFP) Failure2020-2024
The B58 engine's high-pressure fuel pump can fail, though at lower rates than the older N54 engine. When the HPFP fails, fuel pressure drops below the minimum required for proper direct injection, causing long cranking, rough idle, misfires, and in severe cases, the engine stalling and entering limp mode. Failures are more common in cold weather when fuel demands are higher, and can be exacerbated by ethanol-blended fuels.
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View P0191 across all makes →Frequently Asked Questions
What does P0191 mean on BMW?▼
P0191 stands for "Fuel Rail Pressure Sensor Circuit Range/Performance." This code sets when the fuel rail pressure sensor's signal is out of its expected range or doesn't match what the computer expects for current conditions. On direct-injection and many modern engines, this sensor reports fuel pressure in the rail so the computer can precisely control fueling and the fuel pump. When the reading is implausible — too steady, erratic, or inconsistent with commanded pressure — this code is set, sometimes with hard starting, hesitation, or reduced power. It generally points to the sensor or its wiring, though an actual fuel-pressure problem can also trigger it. On BMW specifically, this code is documented across 3 models.
What causes P0191 on BMW vehicles?▼
Common causes on BMW: Faulty fuel rail pressure sensor, Corroded, loose, or damaged sensor connector, Open, shorted, or high-resistance sensor wiring, Actual fuel pressure out of range (weak pump or regulator), Restricted fuel filter or supply line. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0191 on a BMW?▼
Repair costs on BMW range from $500 to $1,500, depending on the specific model and root cause.
Which BMW models have P0191 documented?▼
Au7o has documented P0191 on 3 BMW models: 3 Series, 5 Series, M340i.