VOLKSWAGEN has announced plans to refit its vehicles following the diesel emissions scandal.
New chief executive Matthias Mueller reportedly told a gathering of around 1,000 senior VW managers that its customers would be asked to have illegal software modified "in the next few days".
According to Reuters news agency, he said: "We are facing a long trudge and a lot of hard work."
Mr Mueller replaced Martin Winterkorn, who resigned last week.
VW has admitted that 11 million of its diesel vehicles worldwide were fitted with defeat device software which conned testers into believing their vehicles met environmental standards.
More details have emerged about which brands had the software.
They include five million VW brand cars, 2.1 million Audis, 1.8 million VW commercial vehicles, 1.2 million Skodas and 700,000 SEAT vehicles.
The Environmental Protection Agency said 482,000 of VW's 2009-15 models in the US were fitted with the defeat device, which switches engines to a cleaner mode when they are undergoing official emissions testing.
Once on the road the cars produced nitrogen oxide pollutants at up to 40 times the legal standard.
It is not known how many vehicles in Britain are affected, but the Department for Transport has launched an investigation which will include re-testing to compare laboratory results with real-world driving emissions.
