From a thread you made.
If it's not your O2 sensors, then it's most likely your MAF sensor.
Fault code 1126 & 1133 - 986 Series (Boxster, Boxster S) - RennTech.org Forums
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2003 Boxster S
| 987 Air Box | K&N Air Filter | 76mm Intake Pipe| 996 76mm TB | 997 Distribution T | Secondary Cat Delete Pipes | Borla Muffler | NHP 200 Cell Exhaust Headers |
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