Oxygen Sensor There are actually (4) O2 sensors on your truck. If you look inside the wheel wells behind the fender liner, right about where the frame is one O2 sensor, the other is underneath the truck about half way back in relation to the transmission. If you see where the exhaust joints together, you went about 6" too far.
When you start looking at the O2 sensors, they are normally numbered something like "Bank 1 Sensor 1" Bank 1 is on the passenger side; Bank 2 is on the driver's side. Sensor 1 is the upstream sensor (near the frame, between the block and the cat) and Sensor 2 is near the Y-pipe (downstream of the cat).
Normally it is the upstream sensors (sensor 1) that go first. They see the harshest conditions. You will need; Oxygen Sensor Socket Anti-Seized Penetrating Oil Sometimes it will take 15 minutes or take a few hours it depends on your luck…
The 2005 Ford Expedition has 24 valves.
The 2005 Ford Expedition's engine produces 300 hp @ 5000 rpm.
The gas tank on the 2005 Ford Expedition holds 28.0 gal..
( 28.0 gallons ) according to the 2005 Ford Expedition Owner Guide
( 6 ) per wheel
In a 2005 Ford F-150 and 2005 Ford Expedition : ( the 5.4 litre V8 engine is rated at 300 horsepower )
According to the 2005 Ford Expedition Owner Guide the 5.4 liter V8 takes : ( 7 quarts ) with engine oil filter change
6 per wheel
( 28 gallons ) according to the 2005 Ford Expedition Owner Guide
The Ford 5.4 liter V8 engine has ( 8 engine cylinders )
The 2005 Ford Expedition owners manual shows : for the 5.4 L - 3V - engine ( 7 quarts with filter change )
how many o2 sensors on a ford e350 van 2003