Albert Barnes Commentary 2 Kings 17:34

"Unto this day they do after the former manner: they fear not Jehovah, neither do they after their statutes, or after their ordinances, or after the law or after the commandment which Jehovah commanded the children of Jacob, whom he named Israel;" — 2 Kings 17:34 (ASV)

They fear not the Lord - The newcomers in one sense feared Yahweh (2 Kings 17:33, 41). They acknowledged His name, admitted Him among their gods, and kept up His worship at the high place at Bethel according to the rites instituted by Jeroboam (2 Kings 17:28). But in another sense, they did not fear Him. To acknowledge Yahweh together with other gods is not really to acknowledge Him at all.