Where is the oil pressure switch located on a 2005 Chevy malibu maxx?

The oil pressure switch on a 2005 Chevy Malibu Maxx is located on the driver's side of the engine block, near the oil filter. It's a small switch, usually with one or two wires connected to it. You'll likely need to consult a repair manual or a diagram specific to your engine (either a 3.5L or a 2.2L, depending on your model) for the exact location, as access might be slightly different depending on the engine configuration and accessories.