P0191: Fuel Rail Pressure Sensor A Circuit Range/Performance
Severity: high
What it means: The signal from the fuel rail pressure sensor doesn't make sense to the engine computer: it's out of the expected range or doesn't match what the engine is doing. It can be the sensor or its wiring, or real fuel pressure problems that the sensor is reporting.
Safe to drive? Not recommended for long. It can cause stalling, limp mode or a no-start.
Common symptoms
- Check engine light
- Hard starting or no-start
- Stalling, hesitation or limp mode
Likely causes, ranked
- Faulty fuel rail pressure sensorShop
- Wiring or connector problem at the sensorDIY
- Actual fuel pressure problem (pump, filter or regulator)Shop
Vehicle-specific notes
- 2009–2012 Volkswagen Jetta / Jetta SportWagen / Golf TDI: VW bulletin 2041063 tells dealers to check the high-pressure fuel pump for metal particles when these TDIs show P0087, P0088 or P0191, the codes owners report when the pump fails. Read the full answer · Source
What it means: The signal from the fuel rail pressure sensor doesn't make sense to the engine computer: it's out of the expected range or doesn't match what the engine is doing. It can be the sensor or its wiring, or real fuel pressure problems that the sensor is reporting.
Severity: High. Safe to drive? Not recommended for long. It can cause stalling, limp mode or a no-start.
DIY or shop?
Checking the sensor connector and wiring is DIY. Confirming fuel pressure needs a shop's gauge or scan tool.
Before you replace parts
- Read all stored codes and freeze-frame data, not just this one.
- Check your VIN for recalls, service bulletins and extended coverage.
- Inspect wiring and connectors for the related sensor or part before buying parts.
- Clear the code only after a repair, then confirm it stays off.
Safety / mechanic note
Verify with a mechanic. Stalling in traffic is a crash risk; get it checked soon. A code points to a circuit or system, not always a specific part.