The timing chain kit synchronizes the camshaft and crankshaft to allow the valves to close and open at the right time during the operation of the engine. The engine timing chain commonly produce distinctive rattling noises due to wear, most noise are normal but excessive ones calls for an inspection. This is a complete timing chain kit manufactured by AA Ignition which includes timing chain with 148 links, balance shaft timing chain with 134 links, 42 teeth inner crank sprocket, 23 teeth crank sprocket, guide rail, tensioner and VVT gear. This kit is constructed from only the highest quality materials with precision to ensure that it will work properly on your 2.0L, 2.2L, 2.4L L4 engine. Professional installation maybe needed to avoided serious mechanical damage on your engine. Please note that if you do not align the camshafts correctly, your engine may suffer from serious damage as a result. Professional installation maybe needed to avoided serious mechanical damage on your engine. Compatible with the following vehicles: 2011-2015 LaCrosse 2.4L L4 2011-2015 Regal 2.4L L4 2012-2015 Verano 2.4L L4 2012-2013 Captiva 2.4L L4 2006-2010 Cobalt 2.0L, 2.2L, 2.4L L4 2010-2015 Equinox 2.4L L4 2006-2011 HHR 2.0L, 2.2L, 2.4L L4 2008-2013 Malibu 2.4L L4 2010-2015 Terrain 2.4L L4 2007-2009 G5 2.2L, 2.4L L4 2006-2010 G6 2.4L L4 2006-2009 Solstice 2.4L L4 2007-2009 Aura 2.4L L4 2006-2007 Ion 2.4L L4 2007-2009 Sky 2.4L L4 2008-2009 Vue 2.4L L4 2003-2005 9-3 2.4L L4 Replaces part numbers: 9-4201S, 94201S, C6209S, 9-4201SX, 94201SX, 9-4202S, 12680750, 9-0753S, 76209, 94201SC6209S, 4202S This is a compatible replacement part manufactured by AA Ignition. This variable camshaft timing kit is NOT a genuine OEM part. Vehicle makes and their associated vehicle models are registered trademarks of their respective owners.