P0191 Fuel Rail Pressure Sensor Circuit Range/Performance
The rail pressure reading does not match what the engine computer expects.
Common causes
- Faulty sensor
- Fuel delivery problem
- Pressure regulator fault
Symptoms
- Check engine light
- Loss of power
- Stalling
What to check
- Compare desired and actual pressure
- Check low-side supply
- Inspect sensor wiring
Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0191, follow the service information for that make and model.