P0191 on Lexus: How to Diagnose & Fix
Fuel Rail Pressure Sensor Circuit Range/Performance
1 Lexus model · 1 documented issue · 1 critical
P0191 on Lexus by model: symptoms, diagnosis and fix
The L10 generation GS uses a Denso in-tank low-pressure fuel pump whose impeller was molded from a resin with too little density. The impeller absorbs fuel, swells, and interferes with the surrounding pump body until the pump stops turning. The failure shows first as a rough-running engine and warning lights, then as a stall - and at highway speed a stall raises crash risk. Recovery is often impossible: the car will not restart. This is the same Denso pump defect that grew into one of the largest Toyota recall campaigns ever, and the GS was pulled in over several expansions: 20V012000 covered 2013-2015 GS 350 and 2018-2019 GS 300, 20V682000 covered 2017 GS 200t / 2017-2020 GS 350 / 2019 GS 300, and a 2026 expansion (26V222000) reached 2015-2022 Lexus vehicles including 2016-2020 GS. It is an L10-only issue; the S160 and S190 cars use different pump hardware.
Common Symptoms
- Engine runs rough
- Warning lights and messages on the instrument panel
- Engine stalls at speed
- Engine will not restart
- Loss of power on acceleration
How to Fix
Free recall remedy - dealers replace the fuel pump assembly with a redesigned impeller. Because the GS was covered by multiple overlapping expansions across 2020-2026, a VIN check at nhtsa.gov/recalls is the only reliable way to know your car's status; a car that was 'clear' in 2021 may have been swept into the 2026 expansion. Owners contact Lexus at 1-800-255-3987; Lexus internal codes include 20LA01 and 20LB01.
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Sources for this issue (3)
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 Lexus?
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 Lexus it is documented across 1 model: GS.
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 Lexus?
Repair costs vary widely with the root cause and Lexus 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.