If your engine oil pressure is low, it could be because of a problem with the oil pump, a blocked oil filter, or low engine oil levels. The most common reason for low oil pressure is simply because the engine needs more oil. You can check the oil level by looking at the dipstick, and if it's low, top it up. If you're topping up frequently, there may be a leak somewhere. Once you've ruled out these simple causes, it's time to take your car to a mechanic to have it checked out.