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The 2003 Ford Expedition has rear wheel drive.
According to the 2003 Ford Expedition owners manual : If your Overdrive Off light is flashing : " have your vehicle serviced as soon as possible otherwise damage to your transmission can occur " ( it might just be a sensor )
blown transmission
According to the 2003 Ford Expedition Owner Guide : ( " regular " unleaded , 87 octane )
Make sure it's not in 4 wheel drive.
The transmission may be damaged. My wife and I had an Explorer and it did the exact same thing, and shortly after the transmission went out. Have it checked out at a reputable shop or dealer.
It should be on the passenger side next to the radiator.
For a 2003 Ford Expedition , rear wheel drive : According to a website I was looking at ( 4.6 litre V8 , 13 city / 18 highway ) ( 5.4 litre V8 , 12 city , 16 highway ) miles per U.S. gallon
The 2003 Ford Expedition has a V8 engine.
The 2003 Ford Expedition has 16 valves.
the 2003 expedition does have cabin air filter
The 2003 Ford Expedition is a gas-powered vehicle.