OBD-II Code · Sensors
P0191
Fuel Rail Pressure Sensor Range/Performance
medium severitySafe to drive$150-$400
Rail pressure sensor out of range.
Common symptoms
- CEL
- Hard start
Likely causes
- Failing sensor
- Weak pump
Where to start
- Try the cheapest cause first. Start by checking: failing sensor.
- Cost & scope. $150-$400
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there.
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