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2001 Expedition XLT. 5.4L now has 405,200 miles. Put in a donated tranny at 205k even though the original was performing fine at the time. The new tranny only had 20,000 miles at installation. The pedal adjustment recently broke but I synced the gas and brake pedal to the floor board and disconnected it for future use. I've had several Blower Motor Resisters installed in the last several years for some reason. Some #7 spark plug and coil pack was replaced last year. Some coil packs are original, but plugs are changed every 100k. I have always used Synthetic motor oil 5w30.
Your truck is in nice shape.
Those codes are most likely just a vacuum leak. Cheap fix, check your PCV hose and grommet and vacuum lines. You can do a smoke test or water bottle test to check for the leak.162k here and many issues involving infamous p0171 and P0174 codes. I love the truck and I have too much into it to get rid of it so as said earlier, as long as it’s not as much as a new car payment or as long as it never leaves me stranded, I will keep it till the wheels fall off which I hope is a long long time