Various fuel trim and oxygen sensor limit fault codes can be traced to an internal vacuum leak at the oil separator.
Problems for specific Porsche 911 years:
Car problem reports
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Most reported Porsche 911 problems
The front hood and rear deck lid support struts may fail; replacement is required.
If engine misfiring, rough running, or fuel consumption issues are not resolved quickly, the catalytic converter can overheat and fail.
Various repairs and adjustments to the drive mechanism (including cables) are commonly needed on the Cabriolet tops.
Engine issues related to valve guide wear are common. Oil consumption, smoking at first startup, and valve train noise are all symptomatic of loose guides and worn valve stems. The valve train is complex and should be thoroughly inspected if a problem arises.