P0191 on Toyota
Fuel Rail Pressure Sensor Circuit Range/Performance
P0191 on Toyota vehicles indicates fuel rail pressure sensor circuit range/performance. Au7o has documented this code across 1 Toyota model — most commonly on RAV4. 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.
Common Causes of P0191
- •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
P0191 on Toyota by Model
Toyota RAV4(1 issue)
- Denso low-pressure fuel pump impeller failure causing engine stall (Recall 20V-012 / 20TA02)2019-2020
RAV4s built with Denso low-pressure in-tank fuel pumps are part of Toyota's massive fuel pump recall (NHTSA 20V-012, Toyota 20TA02, later expanded). The impeller was molded from lower-density resin that can absorb fuel, swell and deform, then bind against the pump body and stop spinning. The result is loss of fuel delivery: rough running, hard starts, hesitation, illuminated warning lights, and in the worst case an engine stall while driving at speed, raising crash risk. The campaign grew to millions of Toyota/Lexus vehicles across 2013-2020 model years; RAV4 coverage centers on 2019-2020.
Looking for P0191 on a different make?
View P0191 across all makes →Frequently Asked Questions
What does P0191 mean on Toyota?▼
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 Toyota specifically, this code is documented across 1 model.
What causes P0191 on Toyota vehicles?▼
Common causes on Toyota: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0191 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have P0191 documented?▼
Au7o has documented P0191 on 1 Toyota model: RAV4.