From Carfax.com
"Unfortunately, digital odometers that have been tampered with are even harder to detect than traditional mechanical odometers (since they have no visible moving parts). A vehicle's condition and a detailed history report are the best clues a buyer has for determining whether clocking has occurred.
Auto manufacturers developed the digital odometer, in large part, to alleviate the problem of odometer tampering. Unfortunately just as quickly as the technology is developed, scam artists learn how to use it for the wrong reasons. In this case, they are using the very tools meant to correct mileage on digital odometers to rollback odometers. And it is as easy as surfing the Internet.
Digital odometer calibrators are being purchased online, and despite "disclaimers" from sellers, are being used to perpetrate odometer fraud.
"Just like a hacker can do damage to a computer, someone with the right software and hardware can make a digital odometer read whatever number they want," explained Pat Goss, Automotive Expert and Co-Host of PBS MotorWeek in a video news release. "There are all kinds of problems that used cars have which are virtually undetectable to the untrained person. Digital odometer fraud is one that's becoming more common."
"People mistakenly think digital odometers can't be rolled back, but this scam has gone high-tech. Foreign companies are selling software on the Internet, so that anyone who wants to roll back even a digital odometer can do it," Jack Gillis of the Consumer Federation Of America and author of The Car Book in the video release."