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P0191

Overview

Code

P0191

Code Type

P

Code Class

P0

System

Engine

Severity Level

Medium

Emissions Related

false

Drivability Impact

Major

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0191 indicates fuel rail pressure sensor range or performance issues

Symptoms

Poor acceleration; Rough idle

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

Fuel pressure control

Possible Causes

Pressure regulator issues; Sensor drift

Diagnostic Steps

1 Monitor pressure under load; 2 Inspect fuel system for leaks; 3 Test sensor output; 4 Replace sensor if needed

Drive Safety Notes

Engine performance degraded

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