The camshaft controllers can come loose inside the engine, potentially causing the engine to stall.
Porsche has issued a recall for certain 2010-2012 Panamera and 2011 Cayenne vehicles to fix an engine defect.
The vehicles were produced with camshaft controllers that can come loose inside the engine compartment, potentially causing the engine to stall while underway and increasing the risk of a crash.
Technicians have been instructed to replace the fastening screws to properly secure the camshaft adjusters.
The issue appears to be limited to Porsche's 4.8-liter V8 used in the Panamera S, 4S and Turbo, along with the Cayenne S and Turbo. The campaign affects nearly 18,000 vehicles sold in the US market.
Porsche has not yet announced a notification or repair schedule.