As his fathers — i.e., the dynasty of Jehu, of which he was the last member. Like all his predecessors, he upheld the illicit worship established by Jeroboam I.
Related Commentaries of 2 Kings 15:9
2 Kings 15:9
9 And he did that which was evil in the sight of the LORD, as his fathers had done: he departed not from the sins of Jeroboam the son of Nebat, who made Israel to sin.