Kodžo began training in Mrkonjić Grad with Atletski Klub "Petar Mrkonjić". By the end of his career, he would be named "Best Athlete of Mrkonjić Grad", a once-per-year recognition, on nine occasions. In the men's marathon at the 2000 Summer Olympics, Kodžo finished in 78th place out of 81 finishers in a time of 2:39:14 (hours:minutes:seconds). In the following year, he finished the men's marathon at the 2001 World Championships in Athletics in a personal-best time of 2:35:47. He also won the 2001 Podgorica Marathon in 2:30:11.