The hybrid vehicle and its control method

The hybrid vehicle and a control method. Said hybrid vehicle comprising: an engine (22), the engine is configured to output a driving force; a motor (MG2), the electric means to output power for traveling; a switch (89), said switch structure to set a priority to fuel economy of the fuel economy priority mode, and is configured to cancel the fuel economy priority mode; and a controller configured to: (a) based on the setting operation of the engine and switch to the motor ; (b) supplying fuel to the engine is determined whether degradation; and (c) when the hybrid vehicle using a motor in the driving state of the engine stopping power running, the fuel has degraded when it is determined, followed by a switch to prevent the fuel priority mode.