P0191 - Fuel Rail Pressure Sensor Range/Performance

Fuel rail pressure sensor signal out of expected range.

Code Overview

Fuel rail pressure sensor signal out of expected range.

Common Causes

• Fuel pressure too low/high
• Faulty FRP sensor
• Restricted fuel filter
• Fuel pump issue

Diagnostic Steps

1. Compare commanded vs actual pressure (if available)
2. Check fuel filter and pump operation
3. Inspect wiring/connector

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.