The second-generation Harrier was put on the market in February 2003. The new model further advanced the original concept of "an SUV with the on-road performance of a luxury saloon" with improved handling and state-of-the-art safety features. The initial choice of engines included a 3-liter V6 unit (1MZ-FE) and a 2.4-liter inline 4-cylinder unit (2AZ-FE). The 6-cylinder model was combined with a 5-speed automatic transmission, and the 4-cylinder model came with a 4-speed automatic, and both front-wheel-drive and 4-wheel-drive configurations were available. The top-end Airs grade model was equipped with a V6 engine and an electronically controlled air suspension system. The Harrier Hybrid joined the lineup in March 2005. In a minor model change in January 2006, the 3-liter engine was replaced with a 3.5-liter unit (2GR-FE).