Engine and gearbox (P)
P0191: Fuel Rail Pressure Sensor Issue
The fuel rail pressure sensor is not reading correctly compared to expected values. This can affect engine performance and fuel efficiency.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Check engine light on
- Poor fuel economy
- Engine misfires
- Reduced power
- Hard starting
Common causes
- Faulty fuel rail pressure sensor
- Fuel pressure regulator problem
- Wiring or connector issue
- Fuel pump malfunction
- Blocked fuel filter
How to check it yourself
- Read fault codes with a scanner
- Inspect wiring and connectors for damage
- Test fuel rail pressure with a gauge
- Check fuel pressure regulator
- Inspect fuel pump operation
Can I keep driving?
The car can be driven, but performance may be reduced. Seek repair soon to prevent further issues.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer