Climate control modules can be problematic. Symptoms vary but include failure or persistent dead battery after not using the vehicle for a while.
Problems for specific Porsche 911 years:
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Most reported Porsche 911 problems
Ports and passages for secondary air flow can clog at the cylinder head/cam housing area. Partial engine disassembly may be required to fix the problem.
An accumulation of small air leaks at various locations around the intake manifold/intercooler area can cause performance problems.
Various fuel trim and oxygen sensor limit fault codes can be traced to an internal vacuum leak at the oil separator.