A Summary Of Ahaziah's Life (1 Kings 22:51 - 2 Kings 1:1).
‘ And Moab rebelled against Israel after the death of Ahab.'
One of the consequences of this was that Moab, parts of which had been tributary to Israel for ‘forty years' (per the Moabite Stone), since the time of Omri, rebelled and obtained their freedom. The news of Ahaziah's accident might well have been the spur to Mesha of Mob to make the attempt, although preparations for the rebellion may well have commenced during the last days of Ahab. Ahab may well have intended to crush the rebellion after he had reclaimed Ramoth-gilead. Details of this rebellion by Mesha of Moab are also found in the Moabite Stone (from his point of view).