P0191: Fuel Rail Pressure Sensor A Circuit Range/Performance
The rail pressure sensor reading doesn't match what's expected.
Green, yellow, red: three ways P0191 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Set once, drives fine.
Schedule a repair
Hard starts or power loss. Diagnose soon.
Stop and get help
Stalling or no-start. Don't drive.
Symptoms you might notice
- Hard starting
- Power loss
- Stalling
Common causes, cheapest first
- Failing rail pressure sensor
- Real fuel pressure problem
- Wiring or connector issue
What you can check before calling
- Check fuel filter service
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More fuel & air mixture codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0191 mean?
P0191 means "Fuel Rail Pressure Sensor A Circuit Range/Performance". The rail pressure sensor reading doesn't match what's expected.
Can I drive with code P0191?
It depends on what the vehicle is doing. Green: Set once, drives fine. Yellow: Hard starts or power loss. Diagnose soon. Red: Stalling or no-start. Don't drive.
What causes P0191?
The most common causes are: failing rail pressure sensor; real fuel pressure problem; wiring or connector issue.
Is P0191 a serious code?
It can be. Stalling or no-start. Don't drive.
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