cylinder #1 is the first cylinder from the passenger's side on the rear bank.
bank 2 is the drivers side of the engine on your Ford Explorer ( V6 and V8 )
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Bank 1 is the passenger side of the engine in your Ford Ranger V6
On a Ford Mustang ( V6 and V8 ) Bank 1 is the passenger side of the engine
Bank 2 is the drivers side of the engine in a Ford Explorer ( V6 and V8 )
On a Ford Taurus , V6 engine : firewall 1-----2-----3 ( bank 1 ) 4-----5-----6 ( bank 2 ) front of vehicle > driver
The V6 engine in a Ford Escape : firewall 1-----2-----3 ( Bank 1 ) 4-----5-----6 ( Bank 2 ) front
On a 1999 Ford Contour , 2.5 litre V6 engine : firewall 1-----2-----3 ( Bank 1 ) 4-----5-----6 ( Bank 2 ) front of vehicle > driver
Bank 1 is the passenger side of the engine on a Ford V8 and V6
On a Ford Mustang ( V6 and V8 engines ) Bank 2 is the drivers side of the engine Sensor 2 would be AFTER the exhaust has passed through the catalytic converter
Bank 1 is the passenger side of the V6 engine in a Ford Ranger
Bank 1 is the passenger side of a V6 engine in a Ford Ranger