Danger Doesn't Always Come From Where You Expect It. Blind Spot Monitoring In New Citroen C4. Positive Power. Creative Technologie. Citroen. Citroën is a major French automobile manufacturer, part of the PSA Peugeot Citroën group. Founded in 1919 by André-Gustave Citroën, Citroën was the first mass-production car company outside of the USA and pioneered the modern concept of creating a sales and services network that complements the motor car.