Why does the info center say low oil pressure on a 2005 explorer?

I would say you have low oil pressure. Change the oil and filter. Use 5w20 oil or 5w30 whichever your owner's manual lists, and install a quality filter such as Motorcraft, Purolator, or Wix. Do not use any other weight oil. If the oil pressure is still low stop driving the vehicle and seek professional help.