Where is the oil sending unit located on a 2002 buick century?

The oil pressure sending unit on a 2002 Buick Century is located on the driver's side (left side) of the engine block, near the oil filter. It's a small, usually one-wire, electrical sensor. However, its exact position can vary slightly depending on the engine (3.1L or 3.4L V6). You'll likely need to consult a repair manual specific to your engine for a precise visual location. A picture search online for "2002 Buick Century oil pressure sending unit location" may also be helpful.