Checking Lid Lock At Front And Rear

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2018 Porsche Cayenne, 2017 Porsche Cayenne, 2016 Porsche Cayenne, 2015 Porsche Cayenne, and 2014 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

Check that the lid locks engage when the lids (front and rear) are closed by engaging the upper parts of the lock and that they disengage again when the lid openers are actuated.
Clean and grease the lock if it is difficult to move or corroded.