Enlarge / Volkswagen AG Turbocharged Direct Injection (TDI) vehicles sit parked in a storage lot at San Bernardino International Airport (SBD) in San Bernardino, California, U.S., 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.