At Least At Citroen. It's Simple. Use Less, Pollute Less, Pay Less. The Citroën C3 is a supermini car with a range of inline-4 engines that has been produced by the French automaker Citroën since 2002.. 2006 C3’s redesigned front end features a more imposing bumper, wider lower air intake, single air intake slit below the restyled radiator grille and a re-positioned number plate. The rear now has newly designed lights with crystal coloured mid-sections.