WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
Release and unplug boost pressure sensor connector -position arrow-
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Fig 1: Locating Boost Sensor Connector
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Remove screw for boost pressure sensor and carefully lever out boost pressure sensor.