He put away the image of Baal; not from any principle of conscience (for that would have reached the calves also); but either because he was startled at the dreadful judgments of God inflicted upon his father and brother for Baal worship; or because he needed God's help to subdue the Moabites, which he knew Baal could not do; or to gratify Jehoshaphat, whose help he meant to crave, which he knew he should never obtain without this; and for this reason, it seems, Jezebel was willing to connive at it, as a trick of state.
Related Commentaries of 2 Kings 3:2
2 Kings 3:2
2 And he wrought evil in the sight of the LORD; but not like his father, and like his mother: for he put away the imagea of Baal that his father had made.