Ford E350 V10 2007 Check Engine Light P0191 - Persistent Fault Despite Tune-Up and Fuel Filter Replacement
The OBD system continues to display fault code P0191 on my 2007 Ford E350 V10. I have already taken the vehicle to two separate dealerships, both of which have diagnosed and attempted repairs without resolving the issue. A recent tune-up and fuel filter replacement were performed, but the check engine light remains illuminated. The truck runs smoothly with no noticeable performance issues or drivability problems. I am seeking advice on potential causes and solutions for this persistent P0191 code. Any insights from experienced users or technicians would be greatly appreciated.
P0191 - Fuel Rail Pressure Sensor Circuit Range/Performance. A common issue linked to the Fuel Pump Driver Module (FPDM). This problem may become more prevalent in areas with high salt exposure, such as coastal or winter road regions.