Zod

Hey guys I have been looking at a few cars and in my search came across one i really liked, but after test driving it, the screen flashed red with a check tire pressure warning. Now this has happened to me before in our CLS500 and some one took care of it. Just wondering do 55s have different tire pressure? does any one know the right numbers ? as in pressure for front and back tires, I am kinda of a newbie to this and was hoping to learn how to do it my self.
Any help would be much appreciated thanks