Exhaust system for engine

An exhaust system provided to an engine having an output shaft extending in a specific direction, comprising:

• an exhaust passage through which exhaust gas discharged from the engine circulates;
• a turbocharger having a turbine housing, the turbine housing being formed therein with a passage through which exhaust gas passes and configured to accommodate a turbine wheel being driven by exhaust gas;
• and
• a first purifying part and a second purifying part configured to purify exhaust gas, wherein each of the first purifying part and second purifying part is selected from the group comprising catalyst and filter,
• wherein the exhaust passage includes:
• a first passage part connected to a downstream end of the turbine housing;
• a second passage part having the first purifying part therein and connected to a downstream end of the first passage part;
• and
• a third passage part having the second purifying part therein and connected to a downstream end of the second passage part,
• wherein the first passage part extends to one side in the specific direction from the turbine housing,
• wherein the third passage part extends in the specific direction below the turbine housing,
• wherein the second passage part extends upward from one end part of the third passage part in the specific direction,
• wherein a center axis of the second passage part inclines so that an upper end thereof is located on one side of a lower end thereof in the specific direction,
• wherein the first passage part has in an upper surface thereof an inclined part inclining so that one side of the inclined part is located below another side in the specific direction, and
• wherein an oxygen sensor configured to detect a property of exhaust gas is attached to the inclined part such that a height position of an upper end of the oxygen sensor is located below the upper surface of an upstream end part of the first passage part in an up-and-down direction.