It wasn't too hard to figure it out. After all, Volvo, Volkswagen, and many other automakers use the same parts suppliers to build engine components. Mysteriously, Volkswagen was able to use the same technology as its competitors and pass stringent US diesel emissions laws without expensive urea injections, raising the eyebrows of those in other car companies. "We have the same suppliers, we have Bosch, we have Denso, we are working with the same partners, so we know this technology doesn't exist," said Falck. He followed up with, "I have known that for seven years." For some time, Volkswagen claimed that it was able to pass emissions tests simply by using superior engineering.