Cam tensioner/cam timing issues can cause the Check Engine Light to illuminate.
2006 Porsche Boxster S Problem Reports
Most Reported 2006 Porsche Boxster S Problem Reports
Various fuel trim and oxygen sensor limit fault codes can be traced to an internal vacuum leak at the oil separator.
The power windows not lowering when the Cabriolet top latch and/or door handle is operated or lowering unexpectedly while driving can be caused by a failing Cabriolet top or door handle micro switch. Diagnoses will be required to determine which switch is at fault and will require replacement.