P0191

Fuel Rail Pressure Sensor Circuit Range/Performance Bank 1

Fuel & air metering (fuel delivery) Generic OBD-II High

What it means

P0191 means the fuel rail pressure sensor is giving a reading that doesn't match what the engine control module expects. The ECM uses that value to regulate fuel pressure, so an inaccurate signal — whether the sensor is faulty or the actual pressure is off — can cause hesitation, stalling, hard starting, and sometimes limp mode until it's diagnosed.

High

Can I keep driving? Be cautious — because fuel pressure is controlled from this sensor, the engine can hesitate, stall, or start hard, and may drop into limp mode. Diagnose promptly.

Real-world scan data

Seen in

1,275

scans in the past year

Found in

0.2%

of scans

0.4%

of scans that found faults

Appears alongside · share of P0191 scans

P0113in 15.5% of scans

P0336in 15.3% of scans

P0101in 12.9% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Hesitation, surging, or reduced power (possible limp mode)
Hard starting or occasional stalling
Poor fuel economy

Common causes

Most likely first

Failed or drifting fuel rail pressure sensorLikely
Wiring or connector fault in the sensor circuitCommon
A genuine fuel-pressure problem (weak pump or regulator) the sensor is reportingCommon
Poor sensor ground or reference-voltage faultLess often
Failed engine control module (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and compare the sensor's pressure reading against a mechanical gauge if possible.
Inspect the sensor connector and wiring for damage, corrosion, or a poor ground.
Verify the sensor's reference voltage and signal are within spec.
If actual fuel pressure is out of range, diagnose the pump and pressure regulator; if only the signal is wrong, replace the sensor.
Clear the code and road-test to confirm it stays off.

FAQ

Quick answers

Is it safe to drive with P0191?+

Drive cautiously. The ECM regulates fuel pressure from this signal, so a bad reading can cause stalling or limp mode — get it checked before relying on the car.

Can I just clear P0191?+

It returns quickly unless the sensor, its wiring, or an underlying fuel-pressure problem is repaired.

Read & clear P0191 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX