Enlarge / Volkswagen AG Turbocharged Direct Injection (TDI) vehicles sit parked in a storage lot at San Bernardino International Airport (SBD) at dusk in San Bernardino, California, on Wednesday, April 5, 2017. Volkswagen agreed last year to buy back about 500,000 diesels that it rigged to pass US emissions tests if it can’t figure out a way to fix them. In the meantime, the company is hauling them to storage lots, such as ones at an abandoned NFL stadium outside Detroit, the Port of Baltimore and a decommissioned Air Force base in California. Photographer: Patrick T. Fallon/Bloomberg via Getty Images (credit: Getty Images)

If you own a diesel Volkswagen or Audi that was affected by the company’s 2015 diesel scandal, and if you haven’t submitted the proper paperwork to receive compensation, you only have one month left to do so.

Two years ago, Volkswagen proposed a settlement with a consumer’s class-action group: the automaker would put up more than $10 billion to fix or buy back roughly 475,000 diesel Volkswagens and Audis outfitted with illegal software. The software allowed the cars to pass emissions tests under pre-arranged testing conditions, but the cars suppressed the emissions control system while they were being driven on the road in the real world.

After news of the cheating was made public, the value of the affected vehicles dropped dramatically. Vehicle owners filed a class-action suit in district court, and VW Group proposed its settlement nearly a year later. Customers would have two years to file a claim for restitution. They also had a choice: allow VW Group to buy back their car at the value of the vehicle before the news of the cheating was made public, or allow VW Group to fix the vehicle to bring it into compliance with federal emissions rules. All owners and lessees would receive an additional cash payout as well.