Exhaust gas sensor mounting structure

An exhaust gas sensor mounting structure comprising:

• an exhaust pipe attached to a vehicle engine;
• a catalyst unit which cleans exhaust gas of the engine;
• a silencer connected to a downstream portion of the exhaust pipe;
• and
• an exhaust gas sensor which detects a prescribed component of the exhaust gas, wherein:
• at least part of the catalyst unit is located in the silencer;
• at least part of a pipe that is connected to a downstream end portion of the catalyst unit extends alongside an outer surface of the silencer;
• and
• the exhaust gas sensor is attached so as to penetrate through an outer wall of the silencer and a wall of the pipe, wherein:
• the silencer has a slant surface that goes down as the position goes forward, and is disposed in bottom-rear of the engine, the slant surface being provided at a front half portion of the silencer;
• and
• the exhaust gas sensor is attached to the slant surface, and is covered with a crank case, the silencer and a vehicle body frame from the front side, the rear side, and the left and right sides, respectively.