What does the low oil pressure light mean in a Chevy impala?

Take a look at the oil level. Pull the dip stick and check where the oil level is. You may only be low in oil. Is the engine tapping? If not, take a look at the oil pressure switch. Does it have alot of oil around it? You may want to replace it. If you do have a tap in the engine, you may want to have the oil pump checked for output pressure. Hope this helps.