The Boxster engine includes an emissions device to inject fresh air in to the exhaust (if I remember correctly). There are quite a few threads on it, the codes, and the potential fixes.
Best suggestion I can offer is to clear the codes and see if they return. If they do, then it is time to search for the potential cause. There are many, from failed compressors, failed pressure hoses, etc.
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1999 Boxster Zenith Blue Metallic/Savanna Beige
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