Police said 42-year-old Sou Saechin told them he accidentally shot the teen at about 3 a.m. on Rock Creek Way.
But officials said Saechin went too far in trying to protect his red Honda.
"What we try to stress to people is that deadly force, the use of a firearm, is never justified under any circumstances to protect property," said Sgt. Matt Young of the Sacramento Police Department.
Police said Saechin came outside of his home armed with a .22-caliber rifle and confronted three alleged burglars.
Saechin fired one shot, hitting one of the alleged burglars in the chest. The three fled the scene, police said.