Google has won a court challenge against a 1.49 billion euro European Union antitrust fine imposed five years ago that targeted its online advertising business.

Google is set to be hit by another attack from European Union watchdogs, paving the way for a hefty fine and an order to change its business model unless the US giant takes rapid action to give more prominence to rivals across its sprawling search empire.

Google won a legal challenge Wednesday against a €1.49 billion ($1.66 billion) antitrust fine from the European Union, while chipmaker Qualcomm failed to repeal a penalty.