No, it should be replaced by a good one.
1) The effect on engine
    If the NOx Sensor is fault, it will cause a breakdown to the engine, the multiple trouble lights will be lightened, and ECU will
    make a record of the fault, so we need to change a good one, and delete the fault code to ensure the smooth driving. 

2) Resulting in the disorder on combustion control
    As an important part of the electronic fuel injection system, a faulty NOx Sensor will cause a disorder to the combustion
   control system, that result in the weak acceleration of the engine, idling and vibration, or even can‘t start the engine, etc.