P0191Medium urgency
Fuel Rail Pressure Sensor Performance
Fuel System · Fuel Pressure
⚠️ May cause hard starts and hesitation under load. Service within a few days.
What this means
The fuel rail pressure sensor signal is within electrical range but is not responding correctly to engine load changes — indicating a sensor that reads, but not accurately.
Likely causes
- Failing fuel rail pressure sensorMost common
- Clogged fuel filter causing erratic pressureCommon
- Weak fuel pump causing pressure dropsCommon
Estimated repair cost
Fuel rail pressure sensor$80 – $250
Fuel filter$50 – $175
Fuel pump$300 – $900
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Frequently asked questions about P0191
What does P0191 mean?
The fuel rail pressure sensor signal is within electrical range but is not responding correctly to engine load changes — indicating a sensor that reads, but not accurately.
Is P0191 serious?
May cause hard starts and hesitation under load. Service within a few days.
How much does it cost to fix P0191?
Repair costs for P0191 range from $80 – $250 depending on the root cause and your vehicle.
Can I drive with P0191?
You can drive short distances but should have it repaired within 1–2 weeks to prevent further damage.