Engine-Codes - Lexus - P0191 LEXUS

P0191 LEXUS Code - Fuel Rail Pressure Sensor Circuit Range / Performance

- Code Popularity: 980 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0191 LEXUS Code?

  • Faulty Fuel Rail Pressure Sensor
  • Fuel Rail Pressure Sensor harness is open or shorted
  • Fuel Rail Pressure Sensor circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

|How to Fix the P0191 LEXUS Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P0191 LEXUS code?

Labor: 1.0

The cost to diagnose the P0191 LEXUS code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0191 LEXUS code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P0191 LEXUS Code Mean?

With a cold engine, the internal pressure of the common rail is regulated by the Pressure Control Valve of the common rail assembly. With a warm engine, it is regulated by the suction control valve of the fuel supply pump. When the engine is running with a light load, it is regulated by both the pressure control valve and the suction control valve. Based on signals from the Engine Control Module (ECM), the pressure control valve opens when sudden deceleration occurs to prevent the fuel pressure from becoming too high. The Diagnostic Trouble Code (DTC) will set when the Engine Control Module has determined that the fuel rail pressure is not to factory specifications.

Fuel Rail Pressure Sensor Circuit Range / Performance

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