Germany's auto maker Volkswagen said on Tuesday that up to 800,000 vehicles have been involved in carbon dioxide emission problems.

The company revealed that unexplained inconsistencies were found in the vehicles, which could cost the company 2 billion euros (2.2 billion U.S. dollars). It added that the problems will not affect the safety of the vehicles.

The company was found to install a software in the United States to cheat in emission tests earlier. The software installed by VW in its cars called "defeat device" can turn on full emission controls only when the car is undergoing emission tests so as to meet the legal emission standards. Under normal driving conditions, the cars with "defeat device" software can emit nitrogen oxides at up to 40 times the standard.

VW has admitted that a total of 11 million diesel cars may have been involved worldwide in the scandal. Endit

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