After VW, Mercedes too under scanner for diesel emissions

Gladys Abbott
February 22, 2018

The software used featured multiple functions including one called "Slipguard" that helped the emissions cleaning systems recognize when the vehicle was being tested in a lab for emissions. One piece of software allegedly switched of emissions cleaning after 26 kilometers, allowing the vehicle to showcase normal emission behavior during regulatory testing.

Information relating to the apparent Mercedes-Benz diesel engine emission manipulation software measures comes after news that the German Ministry of Transport is set to demand the German vehicle maker issue a recall for diesel engined versions of its Vito commercial van due to discrepancies.

The report goes on to note that violation notices and related complaints filed by US authorities against another vehicle manufacturer in early 2017 (unnamed in the report, but likely FCA) identified certain functions "common in diesel vehicles" as "impermissible" auxiliary emissions-control devices.

Passenger auto diesel engines have been the focus of clean air concerns since 2015 Volkswagen admitted to installing defeat software on 480,000 diesel engine passenger cars in the U.S., allowing the cars to emit up to 40 times the legally allowed emissions. Daimler AG sought to play down a newspaper report that its own engineers questioned the legality of software used to control diesel equipment in its vehicles, saying United States authorities knew about the allegations and haven't taken action.

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Mercedes also issued a recall of over three million diesel vehicles in Europe back in July. "The authorities know about the documents and no complaint has been filed".

A statement by Daimler said: "We have been cooperating fully for more than two years and are ensuring complete transparency". In Volkswagen's case, some so-called AECDs constituted illegal defeat devices.

The newspaper said the company spokesman would not comment on the report due to ongoing investigations. The lawsuit also claimed that the "Clean Diesel" models of Mercedes-Benz emit higher NOx in real world compared to the lab test conditions. The Editorial department is independent of Cars.com's advertising, sales and sponsored content departments.

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