Before getting into the sport of boxing Koç was kickboxer and won in this sport a 1995 European championship titles and the 1996 World Championship title.
1999 Koç was in the German Championship third in the super heavyweight class at the World Championships in Houston, he lost early against Muchtarchan Dildabekow. The European Championship in May 2000 in Tampere he finished after a semi-final defeat against Alexei Lesin with a third place and qualified for participation in the little later held the Olympic Games in Sydney. There, he disappointed and was spectacular in the first fight in the first round against the Cuban participants Alexis Rubalcaba KO. His record was 32 fights, 23 wins ( including 17 by knockout ), seven defeats and two draws. Koç was active as an amateur for Hertha BSC.
He was in the boxing stable of Wilfried Sauerland professional in 2001, but was never able to convince right. As a relatively small normal boom without special mobility and lack of aggressiveness he did not seem the potential of a future world class professionals to have. But even with the exercise diligence just problems, so that already point victories against only 92kg heavy Roman Bugaj were highly controversial in the construction phase.
After a turn controversial win over former WBC cruiserweight titlist Marcelo Domínguez he was allowed to fight against the British Michael Sprott for the European title, but lost by split decision. A battle for championship against Italian Paolo Vidoz in January 2006 was unsuccessful.
Then he pushed on November 11, 2006 compared his stable mate Timo Hoffmann, but again recorded a point defeat. After the fight, he announced his resignation.
On 8 December 2007, he was against Oleg Platov deny a comeback, however, said the fight from.
30 August 2008 Koç denied a successful comeback against Rene Dettweiler. He won the not the full distance for the next fight on points.
Cengiz Koç is also occasionally active in supporting roles in film and television and has appeared in TV series such as Wolff's Turf, Alarm for Cobra 11 or HeliCops.