P0191 — Fuel Rail Pressure Sensor A Circuit Range/Performance
Category: Powertrain Severity: High
Updated:
DTC code P0191 means: Fuel Rail Pressure Sensor A Circuit Range/Performance. It falls under the "Powertrain" category, with an estimated severity of High. Common causes include drifting pressure sensor, actual pressure incorrect (pump or regulator) and clogged fuel filter; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Drifting pressure sensor
- Actual pressure incorrect (pump or regulator)
- Clogged fuel filter
- Poor connector contact
Symptoms
- Hard starting
- Stumbling
- Loss of power
- Limp mode
How to diagnose it step by step
- Replace the filter if high mileage.
- Compare actual vs measured pressure.
- Check the connector.
- Replace the sensor or pump as indicated.
How to fix it
Compare the sensor reading with a gauge (low-pressure gasoline systems) or spec values. If actual pressure is correct, replace the sensor; if not, check the pump and filter.
Estimated repair cost
$100–900 depending on the part.
Frequently asked questions
What does DTC code P0191 mean?
Fuel Rail Pressure Sensor A Circuit Range/Performance.
Is code P0191 serious?
Severity High. Have it checked as soon as possible, especially if it affects safety or the catalytic converter.
Can I keep driving with code P0191?
Drive only as needed.
Related codes
P0190 P0193 P0175 P0174 P0172 P0171 P0161 P0157 P0156 P0155
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