The Quick Answer above is the generic definition. What follows is the model-specific detail for the BMW models that log P0191.
DTC/P0191·BMW
P0191 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)BMW
P0191 on a BMW 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.
Typical repair cost, all makes€45 - €800
Connect any standard Bluetooth OBD2 adapter to your BMW and Skanyx tells you what P0191 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.
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BMW 3 Series
2006-2024The N54 and N55 engines have a fuel rail pressure sensor that can fail and mimic HPFP symptoms. BMW charges significantly more for the sensor than aftermarket options. The B48 engine in newer models uses a more reliable sensor but can still trigger P0191 from wiring issues.
What causes P0191 on a BMW?
Beyond the generic causes listed on the main P0191 page, these are the patterns noted for BMW models:
BMW 3 SeriesFuel rail pressure sensor failure on N54/N55 (often misdiagnosed as HPFP)
BMW 3 SeriesWiring harness damage near the fuel rail on B48
How to diagnose P0191 on a BMW with OBD2
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 on a BMW? (EUR)
Estimated repair costs for P0191 in EUR, compiled across makes. Expect BMW parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0191
These codes are often seen alongside P0191 or point to related issues, on any make:
Looking for the full P0191 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0191 guideSkanyx · BMW
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