P0191 on Audi: How to Diagnose & Fix
Fuel Rail Pressure Sensor Circuit Range/Performance
1 Audi model · 1 documented issue · 1 critical
P0191 on Audi by model: symptoms, diagnosis and fix
Audi TSB 2067757/3 applies to specified 2017-2020 and 2022-2023 RS3 vehicles when the MIL or drive-system warning is shown, or the engine does not start, with either no stored DTC or P019100 with symptom 5652 or 5653, P008700 with symptom 2838, or P008800 with symptom 2837 or 17897. The bulletin provides an ODIS diagnostic-routing correction involving intermediate-shaft speed sensor G265; it does not establish universal high-pressure-fuel-pump failure, increased failure from tuning, or a failed pump from fuel-pressure symptoms alone.
Common Symptoms
- MIL illuminated
- Drive-system warning
- Engine does not start
How to Fix
Reproduce and document the complaint, scan the vehicle with current ODIS and complete Guided Fault Finding. When one of the listed DTC/symptom combinations is stored but GFF produces no result, manually add and complete the G265 intermediate-shaft-speed-sensor test plan. Repair only the component identified by that diagnosis. Do not replace or upgrade the high-pressure fuel pump from this warning or DTC set alone.
Sources for this issue (1)
P0191 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0191 mean on a Audi?
P0191 stands for "Fuel Rail Pressure Sensor Circuit Range/Performance." This code sets when the fuel rail pressure sensor's signal is out of its expected range or doesn't match what the computer expects for current conditions. On direct-injection and many modern engines, this sensor reports fuel pressure in the rail so the computer can precisely control fueling and the fuel pump. When the reading is implausible — too steady, erratic, or inconsistent with commanded pressure — this code is set, sometimes with hard starting, hesitation, or reduced power. It generally points to the sensor or its wiring, though an actual fuel-pressure problem can also trigger it. On Audi it is documented across 1 model: RS3.
What are the most common causes of P0191?
The most common causes of P0191 are: Faulty fuel rail pressure sensor, Corroded, loose, or damaged sensor connector, Open, shorted, or high-resistance sensor wiring, Actual fuel pressure out of range (weak pump or regulator), Restricted fuel filter or supply line, Loss of reference voltage or ground from the ECM/PCM, Faulty fuel pressure regulator or control valve. The specific cause varies by vehicle.
How much does it cost to fix P0191 on a Audi?
Repair costs vary widely with the root cause and Audi model; each issue on this page carries its own estimate where one is published.
Looking for P0191 on a different make?
View P0191 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.