P0191 — Fuel Rail Pressure Sensor Circuit Range/Performance
| Meaning | The engine computer has noticed that the signal coming from the fuel rail pressure sensor does not match the expected value for the current engine conditions. This means the sensor is either reading incorrectly, or the actual pressure in the fuel system is unstable. |
| Family | Powertrain (P) |
Typical symptoms
Engine surges or lacks power during acceleration
Check Engine light is on
Common causes
Wiring or connector damage in the sensor circuit
Weak fuel pump or clogged fuel filter
Internal fuel pressure regulator failure
What to do
Frequently asked questions
What does code P0191 mean?
Fuel Rail Pressure Sensor Circuit Range/Performance. The engine computer has noticed that the signal coming from the fuel rail pressure sensor does not match the expected value for the current engine conditions. This means the sensor is either reading incorrectly, or the actual pressure in the fuel system is unstable.
Can I keep driving with code P0191 active?
With caution: limp mode possible, have it checked soon
Common causes — P0191
Faulty fuel rail pressure sensor Wiring or connector damage in the sensor circuit Weak fuel pump or clogged fuel filter Internal fuel pressure regulator failure
How do you fix code P0191?
Have a technician check the physical fuel pressure with a mechanical gauge to see if the sensor is lying. It is best to address this soon before it leaves you stranded with a no-start condition.
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