2005-2010 G6 3.5L. 2006-2009 G6 3.9L. 2007-2009 G6 3.6L. 2005-2006 Montana 3.5L. 2006-2009 Montana 3.9L. Locate the old oxygen sensors and carefully remove them from their mounting positions. Install the new oxygen sensors (234-4668) by securing them in place and connecting the wire harness as provided.
