you can change the MAF yourself in about 15 minutes w/ just a t-20 torx
securitydriver. It's like a regular torx driver but has a hole in the middle:
Depending on MY, the only code you might need is for the radio h/u (b/c you'll want to disconnect the (-) term on the battery to reset the check engine light if on). Otherwise, if you have no CEL, then just order the MAF yourself and pick up some security torx bits. Incidentally, you may try and just clean the MAF first to see if that works as the part itself can be quite pricey...
Details here courtesy of Mike Focke's Boxster Page