Help with the codes

[grilla]

Im gettin a 998, 157 code. I have already replaced the maf. Any help with the 998 code

 

[lutter94]

http://www.stangnet.com/mustang-forums/threads/got-code-998-what-does-it-mean.405627/

 

[grilla]

Om also gettin a 512 keep alive memory fail. Does any body know what this means or what it could be?

 

[grilla]

Do u think the 998 code could be a bad computer/ecu?
If im still gettin 157 code after i replaced the maf could it be 1 of the wires?