Volkswagen says false CO2 emissions affect only 36,000 cars.
Volkswagen said last week it would recall and refit 8.5 million vehicles in the European Union.
Volkswagen has come under fire from various authorities.
Volkswagen is looking at ways to cut costs and boost cash flow.
Volkswagen announced plans on Tuesday to refit up to 11 million vehicles and overhaul its namesake brand.
The scandal has also rocked the wider car market, with manufacturers fearing a drop in diesel car sales.
Audi says 2.1 million cars affected by diesel emission scandal.
The company said it would appoint a US law firm to conduct a full investigation
Volkswagen did not name a successor, but said proposals on management appointments would be made to a full board meeting on Friday.
Volkswagen is under huge pressure to act, with its shares down more than a third in value since the crisis broke, and the bad news still coming.
Volkswagen AG said a scandal over falsified US. vehicle emission tests could affect 11 million of its cars around the globe.
Late on Monday, Volkswagen's U.S. chief Michael Horn said the company had "totally screwed up" and promised to make amends.
Volkswagen is lowering group financial targets for this year after setting aside about 6.5 billion euros ($7.27 billion) in provisions this quarter.