Which god did Ahaziah consult about his injury?

Answer: Baal-zebub

Ahaziah sent messengers to inquire of Baal-zebub, the god of Ekron, whether he would recover.

“Now Ahaziah had fallen through the lattice of his upper room in Samaria and injured himself. So he sent messengers and instructed them: “Go inquire of Baal-zebub, the god of Ekron, whether I will recover from this injury.””— 2 Kings 1:2 (BSB)