VW will use hardware and software changes to fix engine emissions (Photo: VW)

Volkswagen, plans to recall 5 million of its diesel-powered vehicles to fix engine management systems that have been programmed to lower emissions in official test cycles.

The German carmaker said in a press statement that "the emissions characteristics" of customers' vehicles will be corrected in the near future. It added that an internal evaluation had yielded a reqired service procedure for the vehicles, which all carry the VW passenger-car brand.

These cars include the 6th-generation VW Golf, the 7th generation Passat and the 1st-generation Tiguan SUV. All are fitted with the Type EA 189 diesel engines that are the focus of the current investigation.

VW, which earlier confirmed that 11 million vehicles across its various brands are involved, didn't discuss how it would deal with Audi, Seat and Skoda brand vehicles.

Dow Jones Newswires quoted a VW spokesman saying that, in Europe, cars with 1.2 and 1.6 liter diesel engines will probably require a hardware change, while 2.0 liter engines can be adjusted with the help of a software update.

The spokesman was also quoted as saying that the changes would increase fuel consumption and CO2 emissions slightly.

According to the report, Volkswagens in the US, which have been mostly sold with 2.0 liter engines, might require both hardware and software changes to meet emissions requirements, which are tougher than in Europe.

Volkswagen confirmed earlier this month that it had installed so-called "defeat devices" on many of its diesel-powered models to make the cars meet emissions requirements while being tested. The manipulation was unveiled by the US Environmental Protection Agency (EPA).

To cover immediate costs, VW has made a 6.5 billion euro provision against 3rd-quarter earnings.