The Quick Answer above is the generic definition. What follows is what is documented for the Volkswagen models that log P0191, checked against manufacturer data and owner reports.
DTC/P0191·Volkswagen
P0191 on Volkswagen: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Volkswagen
P0191 on a Volkswagen 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.
Repair cost on Volkswagen€45 - €800
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Volkswagen Golf
2005-2024The EA888 2.0 TSI direct injection engine uses a high-pressure fuel rail sensor (G247) that operates at 50-150 bar. Sensor failures can mimic fuel pump problems. Always verify with a mechanical gauge before replacing the HPFP. The 2.0 TDI also uses a rail pressure sensor prone to drift at high mileage.
What causes P0191 on a Volkswagen?
Beyond the generic causes listed on the main P0191 page, these are the documented Volkswagen-specific patterns:
Volkswagen GolfG247 fuel rail pressure sensor drift on EA888 engines
Volkswagen GolfConnector corrosion from engine bay moisture on 2.0 TDI
How to diagnose P0191 on a Volkswagen 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 Volkswagen? (EUR)
Estimated repair costs for P0191 in EUR, compiled across makes. Expect Volkswagen parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0191 on Volkswagen
These codes commonly cluster with P0191 on Volkswagen vehicles:
Looking for the full P0191 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0191 guideSkanyx · Volkswagen
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