P0191 Code: Fuel Rail Pressure Sensor Range/Performance
🟠 Moderate severity · drivable
Yes, but the engine may go into reduced-power limp mode — drive gently and get it fixed soon.
What P0191 means
The fuel rail pressure sensor is working, but the pressure reading doesn't match what the computer expects for the current engine conditions. A clogged fuel filter, weak fuel pump, or failing sensor can all cause this. The engine often runs poorly and may enter a reduced-power mode.
Symptoms
- Check engine light on
- Reduced power or limp mode
- Hard starting
- Hesitation under load
- Poor fuel economy
Common causes
- common: Clogged fuel filter
- common: Weak or failing fuel pump
- common: Faulty fuel rail pressure sensor
- less common: Faulty fuel pressure regulator
- less common: Fuel leak or contaminated fuel
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the fuel filter | Yes | $20–80 |
| Test fuel pressure and replace the fuel pump if weak | Mechanic | $300–800 |
| Replace the fuel rail pressure sensor | Yes | $80–250 |
Frequently asked questions
Can I drive with a P0191 code?
Yes, but the engine may go into limp mode with reduced power. Drive gently and have it diagnosed soon.
What causes a P0191 code?
The most common causes are a clogged fuel filter, a weak fuel pump, or a failing fuel rail pressure sensor.
How much does it cost to fix a P0191?
A fuel filter is $20–80. A fuel pump replacement usually runs $300–800, and a new sensor is about $80–250.
Related codes
P0190
P0190 Code: Fuel Rail Pressure Sensor Circuit Malfunction
P0192P0192 Code: Fuel Rail Pressure Sensor Circuit Low
Related guide: MAF Sensor Replacement Cost →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.