Take a look at the oneway valve (black&white color) that operates the SAI system. It is connected directly to the intake plenum cross 'pipe' and if it is wrong way around, it will most likely throw these codes.
I can't remember which - black OR white - side should be towars the plenum, but this is no-dollars fix if that's the issue for your codes.
Location for the valve is a bit tough, but doable and much much easier than AOS change.
This is the part you should be looking for:
https://www.pelicanparts.com/More_Info/96411095002.htm?pn=964-110-950-02-M244
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