The report made no mention of possible penalties, but Chinas 2008 anti-monopoly law allows the National Development and Reform Commission (NDRC), the countrys anti-trust regulator, to impose fines of up to 10% of a companys China revenues for the previous year.
An array of industries, from milk powder makers to electronics firms, have been coming under the spotlight in recent years as China intensifies its efforts to bring companies into compliance with the 2008 legislation.
The auto industry has been under particular scrutiny, with a wave of investigations prompting carmakers such as Mercedes-Benz, owned by Daimler, Volkswagens Audi and BMW to slash prices on spare parts in recent weeks.
The Jiangsu Province Price Bureau, which launched an investigation last month, found evidence of anti-competitive practices after raiding Mercedes-Benz dealerships in the eastern coastal province and an office in neighbouring Shanghai, Xinhua said in its report on Sunday. A Daimler spokesman repeated a statement, first made by Mercedes-Benz on Aug. 5, that it was assisting the authorities with their investigation, adding that it was unable to comment further as it was still an on-going matter.
It is a typical case of a vertical monopoly in which the carmaker uses its leading position to control the prices of its spare parts, repair and maintenance services in downstream markets, Zhou Gao, chief of the anti-trust investigation at the Jiangsu bureau, told Xinhua.
Industry experts say automakers have too much leverage over car dealers and auto part suppliers in China, enabling them to control prices, considered as a violation of the countrys anti-trust laws.
The Xinhua report said the cost of replacing all the spare parts in a Mercedes-Benz C-Class could be 12 times more than buying a new vehicle, citing a report from the China Automotive Maintenance and Repair Trade Association.
Early this month the NDRC said it would punish Audi and Fiat SpAs Chrysler for monopoly practices. Chinese media reported last week that Audi, the best selling foreign premium car brand in China, would be fined around 250 million yuan ($40.7 million).