Print & Online Citroen Car Repair Manuals - Haynes Publishing After going bankrupt again in December 1974, Citroen was partnered with Peugeot, and continued to produce unusual and innovative, if not huge-selling, cars. At Haynes, we have an extensive range of Citroen repair manuals and online procedures available for professional mechanics and DIY car enthusiasts. We can give you all the help you need. C4 | Haynes Manuals Complete coverage for your vehicle. Written from hands-on experience gained from the complete strip-down and rebuild of a Citroen C4, Haynes can help you understand, care for and repair your Citroen C4.