John Gill Commentary 2 Chronicles 14:5

"Also he took away out of all the cities of Judah the high places and the sun-images: and the kingdom was quiet before him." — 2 Chronicles 14:5 (ASV)

Also he took away out of all the cities of Judah the high
places and the images
Perhaps the high places in (2 Chronicles 14:3) design only the high places and altars in Jerusalem, and near it; these in all the rest of the cities of the land; the "images were", as the word signifies, "sun images", either made in the form of the sun, or dedicated to it, or temples for it; (See Gill on Leviticus 26:30),

and the kingdom was quiet before him ;
he had no foreign enemy to molest him, and so took that opportunity to reform divine worship, and in that he met with no opposition from his people.