P0191 on Infiniti: How to Diagnose & Fix
Fuel Rail Pressure Sensor Circuit Range/Performance
1 Infiniti model · 1 documented issue · 1 critical
P0191 on Infiniti by model: symptoms, diagnosis and fix
Fuel pressure sensors were not sufficiently tightened during production. As the vehicle is driven, vibration and thermal cycling allow the under-torqued sensor to loosen further until fuel escapes past its seal. A fuel leak in the engine bay, next to hot exhaust components and ignition sources, is a vehicle fire risk. NHTSA campaign 14V683000 covers QX80 alongside 2012-2014 Nissan Juke, 2012-2013 M56 and QX56, and 2014-2015 Q70 V8 vehicles. The recall began January 25, 2015 and the remedy is simply re-torquing the sensors.
Common Symptoms
- Fuel smell from the engine bay
- Visible fuel wetness or staining around the fuel rail
- Check engine light with fuel pressure or rail pressure codes
- Hard starting or rough running from lost rail pressure
How to Fix
Have the dealer re-torque the fuel pressure sensors under recall 14V683000, free of charge — this is a quick job, not a parts replacement. Independent of the recall, treat any fuel smell from the engine bay on this vehicle as urgent rather than a curiosity: stop driving it, and do not idle it in an attached garage. Look for wetness or a varnish-like stain around the fuel rail and the sensor boss. If the sensor has been loose long enough to damage its seal, re-torquing alone will not stop the leak and the sensor and seal need replacing.
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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 Infiniti?
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 Infiniti it is documented across 1 model: QX80.
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 Infiniti?
Repair costs vary widely with the root cause and Infiniti 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.