So if box 15 on my w2 has the wrong state code, is it still ok to file with the right state code in which I worked with the fake 9 digit #??

It is generally not a good idea to file with a W-2 that is different than the one that your employer has given you. This is because the IRS uses this to match up income. How do you know that your State Code is incorrect? If you have received a corrected W-2, enter that and check the box that indicates that it is a corrected w-2