The exterior was designed by Giorgetto Giugiaro of ItalDesign. It replaced the Stellar as Hyundais large family car. The companys first all aluminum I4 engine, dubbed Theta, debuted in the new Sonata. The diesel version was used as a taxicab in Singapore. The Used Sonata was the highest ranked Premium MidSize Car, beating out the segment defining Honda Accord and Toyota Camry. Consequently, our TradeManager, Contacts Management, and Message Center services may be affected. Com and we will respond to you within 24 hours. This is probably temporary and should be fixed soon. It has a constant need to purchase new hardware.