Installation structure of exhaust gas sensor on internal combustion engine

Abstract

An internal combustion engine is provided with a cylinder head having an intake port and an exhaust port; an exhaust gas sensor which is installed on the cylinder head; a first plug which is installed on the opposite side of the cylinder head from the exhaust gas sensor with respect to the exhaust port so as to be approximately orthogonal to the exhaust gas sensor and to be approximately in parallel with the protruding direction of the exhaust port in view from an axial line of the cylinder head; and a second plug which installed on the same side of the cylinder head with the exhaust gas sensor with respect to the exhaust port so as to be approximately orthogonal to the protruding direction of the exhaust port and to be approximately in parallel with the exhaust gas sensor in view from the axial line of the cylinder head.