P0191 on Alfa Romeo
Fuel Rail Pressure Sensor Circuit Range/Performance
P0191 on Alfa Romeo vehicles indicates fuel rail pressure sensor circuit range/performance. Au7o has documented this code across 2 Alfa Romeo models — most commonly on Giulia, Stelvio. 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 Alfa Romeo range from $200 to $2,000, 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 Alfa Romeo by Model
Alfa Romeo Giulia(1 issue)
- Low-Pressure Fuel Pump Failure Causing Stall (Recall 25V-586)2017-2026
2017+ Giulias can experience sudden engine stall or no-start due to a defective low-pressure fuel pump inside the fuel delivery module. The pump's internal commutator wears prematurely and loses contact, cutting fuel supply at any speed. NHTSA recall 25V-586 (Stellantis campaign 93C) covers free replacement. Symptoms include stalling at idle, no-start hot, and intermittent fuel pump prime noise from the rear of the vehicle. Failures cluster at 30,000-80,000 miles.
Alfa Romeo Stelvio(1 issue)
- Low-Pressure Fuel Pump Failure Causing Stall (Recall 25V-667)2018-2024
2018+ Stelvios can experience sudden engine stall or no-start due to a defective low-pressure fuel pump inside the fuel delivery module — same defect as the Giulia, same supplier, same NHTSA timeline. The pump's internal commutator wears prematurely and loses contact, cutting fuel supply at any speed. NHTSA recall 25V-667 (Stellantis campaign 93C) covers free replacement. Failures cluster at 30,000-80,000 miles; stalls reported at highway speed make this safety-critical until repaired.
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View P0191 across all makes →Frequently Asked Questions
What does P0191 mean on Alfa Romeo?▼
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 Alfa Romeo specifically, this code is documented across 2 models.
What causes P0191 on Alfa Romeo vehicles?▼
Common causes on Alfa Romeo: 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 Alfa Romeo?▼
Repair costs on Alfa Romeo range from $200 to $2,000, depending on the specific model and root cause.
Which Alfa Romeo models have P0191 documented?▼
Au7o has documented P0191 on 2 Alfa Romeo models: Giulia, Stelvio.