The fully distributed output leaderâfollower eventâtriggered resilient control algorithm is proposed for heterogeneous multiâagent systems (MASs) under communication link faults and constraints. An estimation of the information of the leader is achieved by designing a dynamic eventâtriggered observer with resilience to link faults without using the eigenvalues of the global matrix. Zeno behavior is also excluded under the dynamic triggering mechanism. Considering that the state information of the follower is not available, a distributed output leaderâfollower control law is further designed to achieve asymptotically convergence of the leaderâfollower consensus error, and only the output information of followers is required. Finally, the availability of the theoretical results is shown in two numerical examples.