First, the problem is probably the Pressure sensor valve. That is what you get first, and have the Autozone clear the code. I replace all three parts and my mpg has almost doubled. I still get the same MPG as I did when I purchased the car. I also installed a "tornado" - it looks like a fan blade and goes in the air intake duct after the air filter. I had heard that it increase mpg, and I picked up 2-3 MPG and had it ever since installing it.
2003, Ford, Explorer, Check, Engine, Light, EGR, Valve, Error, Code, Repair, Replace