Can I drive with P0191?

Yes, for short distances. The ECU will use default fuel pressure values, which allows the engine to run but with reduced performance and efficiency. If the engine stalls or runs very roughly, have it towed instead of driving.

Is the fuel rail pressure sensor the same as the fuel pressure regulator?

No. The fuel rail pressure sensor monitors and reports fuel pressure to the ECU. The fuel pressure regulator controls actual fuel pressure. P0191 indicates a sensor circuit problem, though an actual pressure issue can also cause this code if the pressure is wildly out of range.

How much does a fuel rail pressure sensor cost?

The sensor itself costs 30-130 EUR depending on the vehicle. Labour is typically 30-90 EUR as the sensor is usually accessible on top of the fuel rail. Total repair cost including diagnosis ranges from 80 to 250 EUR for most vehicles.

P0191: Fuel Rail Pressure Sensor Circuit Range/Performance

Quick Answer

Safe to drive (short-term)

P0191 means the fuel rail pressure sensor is providing readings outside the expected range for current engine operating conditions. The ECU relies on this sensor to precisely control fuel injection timing and quantity, so incorrect readings directly cause poor engine performance, rough running, and drivability issues.

Severity: Moderate · Fuel System
Estimated repair cost: From €45 to €800+, varies by vehicle

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What does P0191 mean?

P0191 is a fuel system-related diagnostic trouble code classified as moderate severity. When your vehicle's ECU detects this condition, it stores P0191 and illuminates the check engine light.

What are the symptoms of P0191?

If your vehicle has triggered P0191, you may notice one or more of these symptoms:

Check engine light on
Engine hesitation or stumbling under acceleration
Hard starting or extended cranking
Rough idle or engine surging
Reduced power output
Possible stalling at idle

What causes P0191?

Here are the most common causes of P0191:

Faulty fuel rail pressure sensor
: high
Corroded or damaged sensor wiring/connector
: medium
Actual fuel pressure problem (pump, filter, regulator)
: medium
Sensor reference voltage issue from ECU
: low
Fuel contamination affecting pressure readings
: low

Is it safe to drive with P0191?

Generally yes, for short-term driving. You can drive to a workshop but expect rough running, reduced performance, and possible stalling. The ECU may use default fuel pressure values which reduces power and efficiency.

How do you diagnose P0191?

Follow these steps to pinpoint the root cause of P0191:

Use a scan tool to monitor live fuel rail pressure data. Compare the sensor reading to manufacturer specifications for idle (typically 3-5 bar for port injection, 50-120 bar for direct injection). Note if the reading is erratic, stuck, or clearly incorrect
With the engine off and ignition on, check the sensor reading. It should show atmospheric or residual rail pressure. A reading of 0 bar or maximum value suggests a sensor or wiring fault
Inspect the fuel rail pressure sensor connector for corrosion, bent pins, or moisture. Clean with electrical contact cleaner if needed
Check the sensor wiring for damage, chafing, or open circuits. Measure the reference voltage at the sensor connector (typically 5V) and the ground circuit
If the sensor and wiring appear fine, verify actual fuel pressure with a mechanical gauge to determine if the sensor is accurate or if there is a real fuel delivery problem
If fuel pressure is correct but the sensor reads wrong, replace the fuel rail pressure sensor

How much does P0191 cost to fix?

Repair costs for P0191 vary depending on the root cause and your vehicle. Here are typical estimates:

Repair	Parts Cost	Labor Cost	Total Estimate	DIY Difficulty
Replace fuel rail pressure sensor	€30–€130	€30–€90	€60–€220	Moderate
Repair wiring or connector to sensor	€5–€30	€40–€120	€45–€150	Moderate
Replace fuel filter	€15–€60	€30–€100	€45–€160	Moderate
Replace high-pressure fuel pump	€150–€500	€100–€300	€250–€800	Professional

Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.

Full repair guides

Fuel Injector Replacement Cost

Engines known for this code

P0191 on specific vehicles

P0191 behaves differently depending on your vehicle. Select your car below for model-specific causes and known issues:

P0191 on Volkswagen

Volkswagen Golf

See Volkswagen-specific causes & cost

P0191 on BMW

BMW 3 Series

See BMW-specific causes & cost

P0191 on Mercedes-Benz

Mercedes C-Class

See Mercedes-Benz-specific causes & cost

These codes are often seen alongside P0191 or indicate related issues:

Common questions about P0191

What does P0191 mean?: P0191 means the fuel rail pressure sensor is sending signals that do not match the expected values for the current engine conditions. This sensor tells the ECU how much fuel pressure is in the rail so it can precisely control injection timing and quantity.
Can I drive with P0191?: Yes, for short distances. The ECU will use default fuel pressure values, which allows the engine to run but with reduced performance and efficiency. If the engine stalls or runs very roughly, have it towed instead of driving.
Is the fuel rail pressure sensor the same as the fuel pressure regulator?: No. The fuel rail pressure sensor monitors and reports fuel pressure to the ECU. The fuel pressure regulator controls actual fuel pressure. P0191 indicates a sensor circuit problem, though an actual pressure issue can also cause this code if the pressure is wildly out of range.
How much does a fuel rail pressure sensor cost?: The sensor itself costs 30-130 EUR depending on the vehicle. Labour is typically 30-90 EUR as the sensor is usually accessible on top of the fuel rail. Total repair cost including diagnosis ranges from 80 to 250 EUR for most vehicles.

Read our detailed guides

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