After already having to pay up for emissions cheating in the past, Mercedes might have a similar problem on their hands again, as they’ve now been accused of using as many eight different emissions test cheat devices on their Euro 6-compliant diesel engines.

According to the Deutsche Umwelthilfe e.V. (DUH), a German non-profit environmental organization, multiple defeat strategies were used cheat emissions tests, resulting in nitrogen oxide emissions increasing once the vehicle was back out on real roads.

Read More: Mercedes Reportedly Sold Over A Million Vehicles With Excess Emissions

To reach this conclusion, the DUH tested a 2016 Mercedes E350 BlueTec 4MATIC wagon by measuring emissions and engine data. What they found was that on the test station, the car stayed within the allowed nitrogen oxide limit, but on the road, nitrogen oxide emissions rose by as much as 500 percent.

Jürgen Resch, Executive Director of the DUH, said: ‘These devices ensure that in almost all situations these cars aren’t clean. They exceed NOx levels by 500% during normal driving. They flood cities with nitrogen oxide. The reason is about maximizing profit at the expense of the environment and at the health of city dwellers. We called upon Daimler in Autumn. We took them to court. They said the company would take a different course. We don’t see this yet. These vehicles that pollute the air with illegal defeat devices need to be recalled.”

See Also: Daimler Allegedly Faced With $1.1 Billion Fine For Diesel Emissions Cheating Software

Looking for more answers, CAR Magazine reached out to Mercedes UK: “The outlined calibrations are known,” they said. “In our view, these are not to be assessed as illegal defeat devices in the interaction and overall context of the highly complex emission control system. The vast majority of rulings in German regional courts and higher regional courts continue to be in Daimler’s favour: In approximately 95% of cases, the courts rule in favor of the company.

“At the regional court level, there are more than 15,500 decisions dismissing lawsuits in favor of the company; in only about 900 cases was the decision against the company. There are now around 900 decisions in our favor at the higher regional courts, and only three decisions against us.

“The German Federal Court of Justice (BGH) has also confirmed key points of Daimler AG’s legal opinion in several decisions. In particular, the Federal Court of Justice (BGH) has held in these and other decisions that an allegedly inadmissible defeat device in the engine control unit alone does not give rise to a claim for damages.”