P0191 on Volkswagen
Fuel Rail Pressure Sensor Circuit Range/Performance
P0191 on Volkswagen vehicles indicates fuel rail pressure sensor circuit range/performance. Au7o has documented this code across 2 Volkswagen models — most commonly on Jetta, Touareg. 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 Volkswagen range from $150 to $10,000, 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 Volkswagen by Model
Volkswagen Jetta(1 issue)
- High-Pressure Fuel Pump (HPFP) Failure2008-2013
Early TSI engines can experience high-pressure fuel pump (HPFP) cam follower wear, leading to fuel system issues. The cam follower rides on the fuel pump lobe and can wear through, causing metal contamination and pump failure.
Volkswagen Touareg(1 issue)
- 3.0L V6 TDI High-Pressure Fuel Pump and Injector Failure2009-2016
The 3.0L V6 TDI engine in the Touareg can suffer from high-pressure fuel pump (CP4.2) and piezo injector failures. The CP4.2 pump is less tolerant of contaminated diesel fuel than the earlier CP3 design and can self-destruct, sending metal shavings throughout the entire fuel system. A single pump failure can contaminate injectors, fuel rails, and fuel lines, requiring complete fuel system replacement. Additionally, piezo injectors can fail individually, causing misfires and rough running.
Looking for P0191 on a different make?
View P0191 across all makes →Frequently Asked Questions
What does P0191 mean on Volkswagen?▼
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 Volkswagen specifically, this code is documented across 2 models.
What causes P0191 on Volkswagen vehicles?▼
Common causes on Volkswagen: 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 Volkswagen?▼
Repair costs on Volkswagen range from $150 to $10,000, depending on the specific model and root cause.
Which Volkswagen models have P0191 documented?▼
Au7o has documented P0191 on 2 Volkswagen models: Jetta, Touareg.