Thrilled to be here ,,,,,

Bought my first MKZ recently it's a 2010 I LOVE THIS CAR. II now have a new dream and it is to own a newer MKZ but happy with what I have all the same . I unfortunately am in the middle of figuring the 300 codes started with 305 replaced coil it did need replacing now it's throwing 302 code Any advice on this topic would be appreciated I am thinking of checking for intake vacuum leaks next before I look into replacing computer I have done a little research on them and would appreciate some clarity about flashing and key fobs Thanks in advance for any help and I thank you for allowing me to join your community