Design: [Function] A belt tensioner or/and idler pulley is a system that guides the serpentine belt and the timing belt on a car engine. Description:Please kindly check the item description and photos to make sure it is suitable for your car before ordering. 2007 Chrysler Sebring 2.4 Serpentine Belt Diagram : A Guide to... Unique Bargains 1 Pcs Engine Belt Tensioner Pulley Assembly Replacement... Please confirm your car model and OE number before purchasing. Usable: [Part Number] 4891595AE Aazon.co: TB1150 Throttle Body for Dodge 2.4L Avenger 2008-2014 Please check relevant operation video when you replace it. The belt tensioner can be mechanic (spring-loaded) or hydraulic. This is a non-OEM product, accessory only! Engine Accessory Drive Pulley Engine Belt Tensioner Pulley Assembly For NISSAN Urvan E25 11955-MA000 OE 4891595AE Helpful: [Fitment] for Chrysler Sebring (2., 4L) 2007-2010, for Dodge Avenger (2., 4L) 2008-2014, for Dodge Avenger (2., 0L) 1999,2008, for Dodge Caliber (1., 8L) 2007-2009, for Dodge Caliber (2., 0L) 2007-2012, for Dodge Caliber (2., 4L) 2007-2011, for Dodge Journey (2., 4L) 2009-2016, for Jeep Compass (2., 0L; 2., 4L) 2007-2016, for Jeep Patriot (2., 0L; 2., 4L) 2007-2015, for Mitsubishi Lancer (2., 4L) 2009-2012, for Mitsubishi Lancer (2., 0L) 2008, for Mitsubishi Lancer (2., 0L) 2011-2012 The function of a pulley and a tensioner is to limit the belt slip.