Where is the oil pump located on a 2000 Daewoo Leganza and how do you replace one?

The oil pump is in the oil pan at the bottom left 'front' of the engine. (Note: The 'front' of the engine is on the passenger side. ) To replace it you will need to remove the catalytic converter, some exhaust piping, the oil pan, the valve cover, the timing chain and timing chain cover. It is bolted to the engine block just above the crankshaft gear.