The settlement is the result of a lawsuit filed by the Attorney General's Office in 2008.

"[The] settlement makes clear that the state will aggressively pursue those stations and inspectors that fail to inspect motor vehicles in compliance with the Massachusetts Enhanced Emissions and Safety Test Program," said Attorney General Martha Coakley in a statement. "Inspection stations and their hired inspectors must realize that they cannot ignore the law with impunity."

Authorities said Greenwood and Boudreau used an illegal practice, known as "clean scanning," to issue inspection stickers to vehicles that would not pass. They allegedly did not conduct the required test on motor vehicles, but instead, tested a "clean" vehicle, or one that they knew would pass the test, and then used the results from that test to issue a passing inspection sticker to the vehicle that came in for the inspection.

The attorney general's complaint said the fraudulent inspections created an unfair competitive advantage for Hillside Service Center over the other inspection stations and inspectors that have been complying with the law in conducting emissions inspections.

The lawsuit against Hillside was one of seven enforcement cases the state initiated in October 2008 to target the clean scanning practice among motor vehicle inspection stations and inspectors.