He did what the Lord said was wrong. He did not stop committing the sins of Jeroboam son of Nebat who caused Israel to sin. Jehoash continued to commit those sins.
Jehoahaz did what the Lord considered wrong. Like Jeroboam son of Nebat, he committed sins that also caused the people of Israel to sin. And he never stopped doing those things.
But the Israelites still did not stop committing the sins of the family of Jeroboam that caused Israel to sin. The Israelites continued committing the sins of Jeroboam. They also kept the Asherah poles in Samaria.
but he did not completely turn away from the sins of Jeroboam son of Nebat that caused Israel to sin. Jehu did not destroy the golden calves in Bethel and in Dan.
Jehoash son of Jehoahaz became king over Israel in Samaria. This was during the 37th year that Joash was king of Judah. Jehoash ruled Israel for 16 years.