The Ex-chief executive of Volkswagen, Martin Winterkorn, has announced that he was not aware of carmaker’s defeat device until it was revealed.

Mr. Winterkorn is set to face a German parliamentary committee, which is probing the issue.

The emission cheating scam first grabbed attention in September 2015 when US regulators said the company had installed software to trick emissions tests for diesel cars.

Meanwhile Mr. Winterkorn handed over his resignation shortly after the scandal broke and he later apologized for the case.

Later it was established that the defeat device used by VW in 11 million cars around the world.

Volkswagen has said was not aware of the problem with the software until late August 2015 and formally reported it to US establishments in early September.

On question that when he and other officials at Volkswagen became aware of the cheating why they had not told investors sooner. He replied: “I, too, am looking for satisfactory answers.”

He also said that he was not aware of the situation before the VW admittance.

In the start of January, Volkswagen self-confessed in front of US prosecutors that about 40 workers had deleted thousands of documents in an aim to hide organized emissions cheating from regulators.

Moreover Volkswagen has been charged $4.3 billion by US establishments and agreed to plead guilty to criminal charges. Not just that, the car-maker has agreed to a $15 billion civil settlement with environmental authorities and car owners in the US.