Overtime the factory MAF sensor can fail or accumulate dirt and oil causing the vehicle into some running issues or light up a CEL (Check Engine Light). If your vehicle is running rough, hesitating after starting or experiencing poor fuel economy then you may have a problem with your mass air sensor. The MAF Sensor can easily be located beside the air intake box inside the engine bay. Fits the following vehicles: 2004-2007 Rainier 2004-2005 CTS 2000-2005 DeVille 2000-2002 Eldorado 2002-2006 Escalade 2003-2006 Escalade ESV 2002-2006 Escalade EXT 2000-2004 Seville 2002-2006 Avalanche 1500, 2500 2001-2007 Corvette 1999-2006 Silverado 1500 2007 Silverado 1500 Classic, 1500 HD Classic, 2500 HD Classic, 3500 Classic 2001-2006 Silverado 1500 HD, 2500 HD, 3500 1999-2004 Silverado 2500 2003-2006 SSR 2000-2006 Suburban 1500, 2500, Tahoe 2006-2009 Trailblazer 2003-2009 Trailblazer EXT 2003-2009 Envoy 2003-2006 Envoy XL 2004-2005 Envoy XUV 1999-2006 Sierra 1500 2007 Sierra 1500 Classic, 2500 HD Classic, 3500 Classic 2001-2006 Sierra 1500 HD, 2500 HD, 3500 1999-2004 Sierra 2500 2000-2006 Yukon, XL 1500, XL 2500 2003-2009 H2 2003-2006 Ascender 2001-2003 Aurora 2005 Bonneville 2005-2006 GTO 2005-2009 9-7x Replaces part numbers: AF10043, 25318411, 25168491, 213-4160, 2134160, 213-364, 213364, 15904068, MF8411, 28411M, 748411, 868411, SU1287 8253184110, SU9516 This is a compatible replacement part manufactured by AA Ignition. This MAF Sensor is NOT a genuine OEM part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this MAF Sensor fits.