On a Ford 5.4 liter V8 engine :
( in a Ford Expedition , Ford F-150 etcetera )
Bank 1 is the passenger side of the engine , Bank 2 is the drivers side
right side exaust, before catlitic converter. (motor side).
Passenger side (Bank1), front of engine, 1st cylinder
Bank1 is the passenger side of the engine on a Ford Explorer
Bank 1 is the passenger side of your 4.0 liter V6 in a 1998 Ford Ranger
On your 2003 Ford Explorer Sport Trac : Bank 1 is the passenger side of your engine Sensor 1 is close to the engine before the exhaust enters the catalytic converter
Bank 1 is the passenger side of a V6 engine in a 2000 Ford Ranger
the number 5 cylinder on a 1998 Ford Expedition 4.6 liter v8 is the first one you see on the drivers side front.
On a 1999 Ford Explorer : For the 4.0 liter OHV , V6 / the 4.0 liter SOHC , V6 / the 5.0 liter V8 engines : Bank 1 is the passenger side of the engine Sensor 2 would be in the exhaust after the exhaust has passed through the catalytic converter ( downstream sensor )
On a 2003 Ford Explorer , 4.0 liter SOHC , V6 engine : Bank 1 is the passenger side of the engine Sensor 1 would be close to the engine before the exhaust enters the catalytic converter
The engine oil dipstick is on the DRIVERS SIDE of your 4.2 liter V6 engine in your 1998 Ford F-150
On a Ford Expedition : Bank1 is the passenger side of the engine Bank 2 is the drivers side of the engine
I know on the 4.0 liter V6 the engine oil filter is on the passenger side of the engine and on the 3.0 liter V6 engine it is on the drivers side of the engine