German carmaker Volkswagen AG assumes it will have to buy back about 115,000 cars in the United States as a result of the emissions scandal, a German newspaper reports.
Without citing its sources, Germany's daily Sueddeutsche Zeitung said the company expected it would have to either refund the purchase price of a fifth of the diesel vehicles affected or offer a new car at a significant discount.
Volkswagen expects that the rest of the vehicles will need major refits, incurring significant costs for parts and a long stay at the garage as parts of the exhaust must be reconstructed and approved, the newspaper reported.
Volkswagen could not be immediately reached for comment.
On Tuesday, VW brand chief Herbert Diess said he was confident the German carmaker would reach agreement with US regulators to bring nearly 500,000 diesel vehicles into compliance with US emissions laws.
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In an interview with Reuters, Diess said fixing older VW cars equipped with 2.0-litre diesel engines would be more difficult than bringing more recent models into compliance.
Some US regulators and lawmakers have said VW may have to buy back older models. Diess did not say whether VW was discussing that, but said he was optimistic an agreement with US regulators would be reached soon.
The US Environmental Protection Agency said on Wednesday that "recall discussions with the company have not produced an acceptable way forward. EPA continues to insist that VW develops effective, appropriate remedies as expeditiously as possible".
The US Justice Department on Monday sued Volkswagen for up to $US48 billion ($A68 billion) for allegedly violating US environmental laws.
The Sueddeutsche Zeitung also reported that about 50 employees - including several division heads - had come forward as part of an internal amnesty program to help the company clear up the scandal.
Volkswagen has admitted it installed software in certain diesel models sold in the United States, that allowed the cars to pass government emissions tests, but then emit nearly 40 times the allowed levels of pollutants on the road.
