If a Porsche dealer did the work then I would take the car back to them and have them sort it out.
If that is not possible then I would disconnect the battery to let the DME re-learn the MAF settings and see if it still throws codes after that.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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