DS 4 (for C4 Coupé) The Citroën C4 is a car produced under their Citroën marque, from the French automaker PSA Group, and later Stellantis. It was positioned to be the successor to the Citroën Xsara. The first generation production started in September 2004. Read the definitive used Citroën C4 Picasso 2013 - 2018 review from What Car?. We tell you what you need to know before you buy. • Citroen C4 Picasso review. Citroen reckons that most buyers will opt for the more powerful 113bhp diesel. And while the 91bhp engine fitted to our car is smooth, and the five-speed gearbox it Abcr0.