The popular Nissan Sentra receives minor enhancements for 2006, including an in-dash 6-disc CD changer added to the Audio Fanatic Package and two new colors – Sapphire Blue and Sunburst (new for 1.8 S). The Sentra continues to use a standard 1.8-liter 4-cylinder engine, which meets ULEV (Ultra Low Emission Vehicles) standards.