VW launches investigation into 'defeat device' allegations

Consequently, the US Environmental Protection Agency (EPA) said it is issuing a notice of violation (NOV) of the Clean Air Act (CAA) to Volkswagen, alleging that certain four-cylinder Volkswagen and Audi diesel cars from 2009-2015 contain the so-called defeat device, an algorithm in the ECU that identifies when a vehicle is on a rolling road for emissions testing and de-rates the engine accordingly.

In a separate action, California is issuing an In-Use Compliance letter to Volkswagen, and EPA and the California Air Resources Board (CARB) have both initiated investigations based on Volkswagen’s alleged actions.

Cynthia Giles, assistant administrator for the Office of Enforcement and Compliance Assurance said: “Using a defeat device in cars to evade clean air standards is illegal and a threat to public health.

“Working closely with the California Air Resources Board, EPA is committed to making sure that all automakers play by the same rules. EPA will continue to investigate these very serious matters.”