Question

2005 Ford Five Hundred Limited with engine code P0191, what could be the issue for code P0191?

Answer 1

P0191 Fuel rail pressure sensor circuit range / perfromance

When you have this code condition , a fuel pressure test has to be perfromed, low fuel pressure or a failing fuel pump usually set this code condtiion, if the fuel pressure is below specification, a fuel pump would be the solution

Answer 2

P0191 FORD Code - Fuel Rail Pressure Sensor Circuit Range/Performance
Read more: https://www.autocodes.com/p0191_ford.html