The disclosure includes embodiments for determining a working status of a set of sensors onboard in a connected vehicle through a validation of roadway segment activity data. In some embodiments, a method for the connected vehicle includes receiving, via a communication unit of the connected vehicle, a Vehicle-to-Everything (V2X) message that includes off-board roadway segment activity data. The method includes generating onboard roadway segment activity data of the connected vehicle. The method includes determining a working status of a set of onboard sensors of the connected vehicle based on an evaluation between the onboard roadway segment activity data and the off-board roadway segment activity data. The method includes modifying an operation of a vehicle control system of the connected vehicle based on the working status of the set of onboard sensors.