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Something is peculiar here, a 99 Boxster should carry a 5.2.2 DME, but some of these codes are for the 7.2 DME, which is from a 01-02 "S" model Boxster.
That said, P1124 and 1126 are O2 sensor (both banks are lean); P0446 and 0455 are EVAP system codes (massive vacuum leak in EVAP system); P1313 to P1319 are cylinder misfire codes.
Considering the EVAP system leak codes, the O2 sensor codes make sense; the misfire codes may also relate to the lean conditions.
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