The current work describes the catalytic soot oxidation activity of metal‐doped manganese oxide (Mn1.9M0.1O3–δ; M = Co, Cu, and Ni) materials, synthesized by coprecipitation method. All the fabricated materials were characterized using X‐ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller surface area analysis, and X‐ray photoelectron spectroscopy (XPS). XRD analysis confirmed the formation of solid solution Mn1.9M0.1O3–δ (M = Co, Cu, and Ni). M‐doped samples exhibited different morphology when compared with pure Mn2O3 as evidenced by FESEM analysis, and Co‐doped Mn2O3 possessed the highest specific surface area. XPS analysis revealed the presence of multiple oxidation states of Mn (+4, +3, and +2) and Co (+2 and +3). Soot oxidation activity tests, performed using thermogravimetric analysis, showed that Mn1.9Co0.1O3–δ exhibited better catalytic performance (T50 = 390°C) when compared with pure Mn2O3 (T50 = 490°C). The incorporation of dopants greatly enhanced the oxygen vacancies and redox properties of Mn2O3.