How do you fix trouble code p0191?

Trouble code P0191 indicates an issue with the fuel rail pressure sensor or its circuit, often related to fuel pressure being out of range. To fix this code, start by inspecting the fuel rail pressure sensor and its wiring for damage or corrosion. If the sensor appears faulty, replace it; otherwise, check the fuel pump and fuel filter for proper operation. After addressing the issue, clear the code and perform a test drive to ensure it doesn't return.