In December 2015, Volkswagen India had announced the recall of 3.23 lakh vehicles to fix the emission software. The automaker admitted the use of defeat device in 11 million diesel engine cars sold in the US, Europe and other markets.

The NGT bench headed by Justice Jawad Rahim said, "The counsel for respondent numbers 4 to 7 (Volkswagen) submits that in compliance of the order dated February 17 they have prepared a roadmap and would be filing the same by tomorrow. He should file it by tomorrow positively, with copies to all the counsels in this case."

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Previously, after the test conducted by Automotive Research Association of India (ARAI), Volkswagen India decided to fix the software by recalling 3.23 lakh cars fitted with EA 189 diesel engines.

But Volkswagen has said that it was a voluntary recall, and the company is not facing any charges for violating emission norms in the country. The counsel for the automaker had told NGT that, ARAI approved the new software for only 70 percent of the recalled vehicles.

In reply, ARAI also said that Volkswagen had submitted the redesigned software for only 70 percent of the vehicles. And it is yet to fix the software in remaining 30 percent vehicles.

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Volkswagen admitted the use of defeat device in the diesel vehicles in the US. Since then, the automaker is facing several charges in various markets across the globe. VW Group's brands such as Audi and Porsche are also facing charges in Germany. Now, NGT is investigating the issue in India.