Citroen C6 Automotive Repair Manuals - Car Service and Purpose of this is to catalog and include a comprehensive, relevant and accessible database for your Citroen C6. To get started, select the appropriate high-quality original PDF “fix-it” manual for your C6, to get the problem sorted right away Citroen C6 2005 Technical Service Repair Manual citroen 2005 C6 Workshop Service Repair Manual Engine  Citroën C6 Workshop & Owners Manual | Free Download Citroën C6. In May 2006, the French car maker Citroen officially launched their executive car Citroen C6. C6 is based on the C6 Lignage Prototype which was first showcased at the Geneva Motor Show in 1999. C6 was introduced to replace the ageing XM that was first produced in 1989.