drivers side cylinder head under the intake manifold....
The thread on cap on your engine coolant reservoir is the " radiator cap "
On your 1999 Ford Expedition : The thread on cap on your engine coolant reservoir ( located at the front of the engine compartment , on the drivers side ) is the pressure cap / radiator cap
The oil pan is bolted to the bottom of the engine
It is on the passinger side behind the converter.
Do you mean P0125 ? Insufficient coolant temperature for closed loop fuel control The causes could be : low engine coolant level leaking or stuck open thermostat malfunctioning ECT (engine coolant temp) sensor Have you noticed your engine temperature gauge running cooler ? If so it is most likely the thermostat sticking open
Can it make the vehicle kill or not stay running what does it actually do.
According to the 2005 Ford Expedition Owner Guide the 5.4 liter V8 takes : ( 7 quarts ) with engine oil filter change
yes - 8 spark plugs for a gas V8 engine
For a 2000 Ford Expedition : The 4.6 liter V8 engine uses the ( 4R70W ) The 5.4 liter V8 engine uses the ( 4R100 )
On a Ford Expedition : Bank 1 is the passenger side of the V8 engines
try a 18mm socket
its in the left(drivers) side exhaust pipe comming off the cylinder head. its the sensor toward the rear of the vehicle.