ensure they are properly seated before selling or dealer-trading the vehicle. No parts were needed for replacement but cautioned customers to have it checked as catastrophic engine failure could occur if not repaired. GMC Yukon Denali The GMC Denali nameplate started as the luxury version of the Yukon for the 1999 model year. The Denali is available on both standard and XL versions and is the top-of-the-line trim in the GMC Yukon lineup. 1999–2000 In 1998, at the time of its introduction, the Yukon Denali was GM's answer to the Lincoln Navigator, but then GM introduced a clone to the Yukon Denali and rebadged it "Escalade" under the Cadillac nameplate. The Yukon Denali's exterior was shared with the Cadillac Escalade, with the entire front clip and lower side body panels differing from the standard Yukon. In the interior, in addition, the Denali features luxury options not available in the Yukon. These included an upgraded leather interior, power seats, heated seats front and rear, Bose stereo system, and some woodgrain on the dashboard. The 1999 Yukon Denali and Escalade also saw the first application of GM's OnStar communications system in a full-size SUV. 2001–2006 Even though the Yukon was redesigned alongside the Chevrolet Suburban and Tahoe in 2000, the Denali and Escalade remained on the GMT400 platform. It was not until 2001 that the Denali and Escalade were redesigned. While the Escalade departed from its Yukon based exterior design scheme in attempt to hide its roots, the Yukon Denali's exterior is almost the same as that of a post-2000 model year GMT800 Yukon. Embossed side body panels and slightly reworked headlights with projector-beam lenses along with 17" polished wheels and a unique grille and front bumper differentiate the Yukon Denali from the regular Yukon. 2001 also saw the introduction of the "punch" grille which now has become the hallmark of the Denali nameplate. 2007–2014 The Yukon Denali was redesigned for the 2007 model year alongside the regular mainstream Yukon. The biggest change was in the styling, such as the flattened tailgate reminiscent of the new Tahoe, and particularly the grill and headlight shapes, which made the Yukon look less aggressive than previous models. The only exterior difference between the Yukon Denali and the standard Yukon are the chrome grille and extensive use of chrome accents; and of course the insignias, embeveled rockerpanels, chromed headlights and the Vortec 6200 engine which it