Received information the automakers held meetings to discuss clean technologies aimed at limiting car exhaust emissions.
Emissions flap has already cost the German automaker $20 billion in fines and civil settlements in the US.
Guarantee applies to new cars bought from a Volkswagen dealer from April 1 through the end of the year.
Vehicles were programmed to turn on pollution controls during testing and off while on the road.
VW and Audi vehicles with 2-litre diesel engines make up the bulk of those caught up in Volkswagen’s emissions cheating scandal.
Could pay as much as $4 billion if it can’t repair many of the cars in a way that satisfies regulators.
Company has agreed to plead guilty to criminal charges and pay $4.3 billion in penalties.
The automaker has reached a $15 billion civil settlement with environmental authorities and car owners in the US.
Oliver Schmidt charged with conspiracy to defraud the US government and wire fraud.
Global sales rose to 567,900 from 487,700 despite the damage to the company’s reputation.
Most owners of affected cars that exceed US emissions standards are expected to sell their cars back to VW.
Some owners want the full purchase price of their vehicles; others oppose deductions for extra mileage.
NLRB ruled the German automaker was engaging in unfair labour practices.
To begin production at Tennessee plant toward the end of this year.
Preliminary approval would allow vehicle owners to be notified of terms