Fiat vehicles use transponder and smart keys, mainly in smaller city cars. Dealers can replace and program keys via VIN; some locksmiths also offer on-site service. Frequent issues include lost keys, battery replacements, and fob malfunctions.

U.S. Models & Years

 500 (1957–1975; 2007–present); 500L (2012–present); 500X (2014–present); Panda (not U.S. sold); Tipo (not U.S. sold).