My wife has a 2004 Freestar that gave a code for the Fuel pressure sensor. I changed the sensor but the problem still exists. I traced the wires fairly far and did not see a bad wire, although I could still go further. Could it be the connection from the wiring harness to the pressure sensor. Its a 4.2 Limited. Any suggestions will help.

 

Being a 2004 and how many miles on it? Fuel pressure sensor code could be for something as simple a a low flowing fuel filter to a tired fuel pump. When was the fuel filter replaced last? I replace mine every 30,000 miles (every 2 years) and I tend to see about a 2 MPG drop in mileage. This past winter was terrible on my mileage, so I can't imagine what my filter will look like when I replace it within the next month or so. When I replace my filter, there's all kinds of crud that always pours out of the filter regardless of where I get my fuel. It's pretty bad how much crug gets pumped into the fuel tank. Have you checked to see what the actual fuel pressure is at the fuel rail?

 

It has around 115000 miles, I don't know when the last time the fuel filter was replaced since we bought it in the fall. We may have put 2000 miles on it since. I will check the filter out today. Today I pulled the plug to the computer since they are known for getting water in the connection. Im also checking the connections to the rest of the ignition system while its apart.