If the vehicle cannot return to run position after start or if the interior fan is not getting power, it may be the electrical portion of the ignition switch has become erratic or has failed. The entire switch assembly should be replaced.
Car problem reports
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Most reported 2007 Porsche Cayman S problems
Smoke, oil consumption, and fuel trim issues with various fault codes can be traced to an internal leak at the oil separator.
A fault with the camshaft tensioner may cause camshaft timing issues resulting in illumination of the Check Engine Light.