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Well, that's a new-to-me reason those codes throw a CE light!
These are oxygen sensor codes. Sometimes, the MAF is fouled or going out and the computer won't tell you it's going out but will tell you something is awry with the O2 sensors. Or, an O2 sensor has gone out and it will tell you the MAF is bad.
When it comes to emissions, the diagnostic codes on Porsches are not that accurate in my opinion.
If you know your Boxster has never had all four O2 sensors replaced, it's a smart thing to budget for and do sooner than later. When I replaced mine after 90k miles (all four mind you) I got a lot more power and far better fuel economy. You don't want to replace just one or one bank...
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