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
The check-engine light or drive-system warning comes on, or the engine does not start. The engine module stores either no fault, or fuel-pressure sensor implausible signal (P019100) or rail pressure too low (P008700) or too high (P008800) with specific symptom codes. If Audi's Guided Fault Finding gives no result for these codes, the bulletin has the dealer add the intermediate-shaft speed sensor (G265) test. Applies to: 2017–2020 and 2022–2023 Audi RS 3 with the 2.5 TFSI five-cylinder (all VINs), per bulletin 2067757/3 (July 31, 2023).
Common Symptoms
- MIL illuminated
- Drive-system warning
- Engine does not start
How to Fix
Have an Audi dealer reproduce the complaint and run Guided Fault Finding. If it gives no result for one of the listed fault and symptom-code combinations, the bulletin requires the G265 intermediate-shaft speed sensor test to be added manually and worked through; its labor list includes removing and installing the sender. Repair only the part the diagnosis identifies. The bulletin is covered up to 48 months/50,000 miles and is informational only outside warranty. Normal warranty rules apply; this is not a recall or a promise of free repair. The exact combinations are P019100 with symptom 5652 or 5653, P008700 with 2838, or P008800 with 2837 or 17897. The additional test is only appropriate when all vehicle, engine, gearbox, equipment, part-number and software criteria match the bulletin; the historical issue ID does not establish a failed high-pressure fuel pump.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.