Problems for specific Porsche 911 years:
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Most reported 1990 Porsche 911 problems
Check Engine Light illumination and performance issues can be caused by oxygen sensor faults.
The accumulation of moisture at major connectors and control units can cause various ABS/PDAS faults due to corrosion.
If engine misfiring, rough running, or fuel consumption issues are not resolved quickly, the catalytic converter can overheat and fail.
The front hood and rear deck lid support struts may fail; replacement is required.
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.