1997 Ford Expedition 4.6L P0446 Code: Troubleshooting Guide and Solutions

Model: 1997 Ford Expedition Fault Code: P0446 Posted: 2015-06-01 11:43

Hi everyone, I'm looking for a reliable troubleshooting guide or flowchart for the recurring P0446 code on my 1997 Ford Expedition with the 4.6L V8 engine. I've already replaced the fuel cap with an original Ford fuel cap as recommended by a mechanic, and also replaced the evaporative emission (EVAP) vent valve that returns fumes to the intake manifold—yet the issue persists. Any insights or diagnostic steps would be greatly appreciated. Thanks, Clint Crowe