Sensor system and fault detection method for sensor system

The invention provides a sensor system capable of detecting a fault of a DA converter and a fault detection method of the sensor system. A sensor system is provided with: a sensor element to which a control current is input; a DA converter that outputs the control current; and a control unit that generates a control current instruction value and inputs the control current instruction value to the DAC, and is further provided with: an instruction value generation unit that sequentially generates a check current instruction value, which replaces the control current instruction value and is input to the DAC, for each generation cycle; an inspection current detection unit that detects an inspection current value of the inspection current; a predicted value calculation unit that calculates an inspection current predicted value, which is a predicted value of the inspection current value; a difference acquisition unit that acquires a difference between the inspection current value and the predicted inspection curren