OBD-II code · Powertrain (generic)
P0191 Fuel Rail Pressure Sensor Circuit Range / Performance
The fuel rail pressure sensor signal is within electrical limits but doesn't match commanded rail pressure under various engine loads. Common in common-rail diesel and GDI petrol engines.
Is it safe to drive with P0191?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyPressure sensor drifted
- PossiblePressure regulator stuck
- Less likelyHigh-pressure pump worn
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Fuel Rail Pressure Sensor, High Pressure Pump, Rail Pressure Regulator
Related codes
- P018EFuel Pressure Sensor B Circuit Intermittent/Erratic
- P018FFuel System Over Pressure Relief Valve Frequent Activation
- P0190Fuel Rail Pressure Sensor Circuit
- P0192Fuel Rail Pressure Sensor Circuit Low Input
- P0193Fuel Rail Pressure Sensor Circuit High Input
- P0194Fuel Rail Pressure Sensor Circuit Intermittent
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.