High Court Rules Major Car Firms Largely Cleared in Emissions Cheating Claims, Legal Battle Continues

By Decode Today News

Major car firms found not to have installed emissions-cheating devices Business

A High Court judge has largely cleared several prominent car manufacturers of claims they installed "prohibited defeat devices" designed to cheat on emissions tests. The landmark ruling today found that most of the contested emissions-control strategies in sample vehicles from Mercedes-Benz, Renault, Nissan, Ford, and Peugeot and Citroen did not constitute illegal devices, marking a significant development in the extensive legal action brought by approximately 1.6 million motorists.

Key Ruling on Car Emissions Devices

In a complex legal battle involving claims of widespread emissions test manipulation, the High Court has ruled that most strategies used by major car manufacturers, including Mercedes-Benz, Renault, Nissan, Ford, and Peugeot-Citroen, were not "prohibited defeat devices." The judgment provides a partial victory for manufacturers, though it identified one specific device in older Mercedes cars and another in some Peugeot-Citroen vehicles as non-compliant, signalling ongoing contention and potential further legal steps. The ten-week trial, which concluded in March, focused on 20 sample vehicles from the five lead manufacturers. Lady Justice Cockerill's 369-page ruling stated that "the Court rejected most of the principal allegations advanced against the manufacturers whose vehicles were examined at trial" and found that "in the majority of instances, the Court found that the relevant strategy did not constitute a prohibited defeat device." This means that while motorists alleged they were misled about the true emissions performance of their diesel cars made from 2009 onwards, the court determined that the bulk of the engineering choices in question were legally permissible. However, the ruling was not an outright dismissal of all claims. The judge identified one emissions-control strategy in Mercedes cars, which was subsequently removed in 2015, and another used in some Peugeot-Citroen vehicles, as falling within the definition of a prohibited defeat device. This partial finding provides a glimmer of hope for the claimants' legal teams, who view the identification of even a few illegal devices as a crucial step forward in their case. Barristers representing the 880,000 motorists specifically involved in this part of the trial had argued that the devices installed in the cars allowed them to detect when they were undergoing official emissions tests. This detection, they claimed, triggered a change in the vehicles' operation to reduce harmful emissions to fall within regulatory limits, only for these systems to be less effective or turned off during regular road use to enhance performance. The High Court judge, however, clarified the legal threshold for a "defeat device." Lady Justice Cockerill stated that for such a device to be found, "there needs to be an intention to cause the emissions control system to operate differently when it senses it is being tested." She further elaborated that "it was not enough for the Claimants simply to establish that the challenged strategies reduced the effectiveness of emissions-control systems outside the relevant testing conditions." This interpretation places a high bar on proving intent to deceive during official testing, rather than simply demonstrating a discrepancy between lab and real-world emissions. Mercedes-Benz, one of the manufacturers at the heart of the legal proceedings, welcomed the overall ruling. However, the German carmaker expressed disagreement with the court's finding regarding one of its four sample vehicles being non-compliant prior to a 2015 software update. A company statement affirmed, "In our view, the emission control software functionalities are justifiable on both technical and legal grounds. We are actively considering all of our available options, including a potential appeal." This signals that the legal battle, particularly concerning specific technical aspects and the interpretation of regulations, is far from over. On the claimants' side, there was a mixed reaction. While acknowledging that most allegations were rejected, solicitors for the motorists noted that Justice Cockerill had indicated that "if an alternative approach to the meaning of 'defeat device' were taken, a larger number of devices would be established, including devices in each of the lead manufacturers cars." This suggests that the legal definition itself played a critical role in the outcome and could be a point of contention in future appeals or related cases. James Oldnall, managing partner at Milberg, a firm representing some of the claimants, expressed satisfaction, stating: "We are pleased that the court has ruled that Mercedes installed illegal defeat devices, just like Volkswagen back in 2015. The fight is not over on this case, but the first domino has fallen. We are on the right path and will continue pushing to hold these carmakers to account." The broader legal action involves around 1.6 million motorists who either bought, leased, or acquired a diesel vehicle from one of the implicated companies, with the majority residing in England and Wales. This specific trial only examined 20 sample vehicles from five manufacturers. The wider case also encompasses models made by a much larger group of manufacturers, including Opel and Vauxhall, Volkswagen and Porsche, Jaguar Land Rover, BMW, FCA and Suzuki, Volvo, Hyundai-Kia, Toyota, and Mazda. This indicates that even with this ruling, the legal challenges facing the automotive industry over emissions are extensive and multifaceted. This High Court decision unfolds against the backdrop of the global "Dieselgate" scandal, which first came to light in September 2015. That year, the US Environmental Protection Agency accused Volkswagen of deliberately installing "defeat devices" – specialized software – in its diesel cars. This software was designed to detect when a car was undergoing official emissions tests, activating systems to reduce nitrogen oxide output. However, once the vehicles were back on the road, these systems were deactivated to improve performance, resulting in significantly higher pollution levels than official figures suggested. Volkswagen subsequently admitted to fitting approximately 11 million cars worldwide with these devices and has paid out around Â£27.8 billion globally in fines and compensation, primarily in the US, including Â£193 million to 91,000 British motorists. The precedent set by the Volkswagen case has fueled similar legal actions against other manufacturers across various jurisdictions. The implications of such emissions issues extend beyond legal and financial penalties. During the High Court trial, barristers for the car owners cited a report from the Centre for Research on Energy and Clean Air (CREA). The report highlighted that excess nitrogen oxide, a byproduct of diesel engines, was linked to an estimated 124,000 premature deaths and 98,000 new cases of asthma in children across the UK and Europe between 2009 and 2024. These figures underscore the serious public health consequences associated with higher-than-declared vehicle emissions. Looking ahead, a further trial is scheduled for October this year. This upcoming proceeding will focus on determining the consequences of any actionable breaches found in the current ruling, as well as addressing issues related to potential damages or other remedies for the affected motorists. The legal landscape for the automotive sector remains complex, with significant questions still to be resolved regarding accountability, compensation, and the precise interpretation of emissions regulations.

Frequently Asked Questions About Car Emissions Claims

What is a "Prohibited Defeat Device"?

According to the High Court ruling, a prohibited defeat device is an emissions-control system intended to cause a vehicle's emissions control system to operate differently when it senses it is being tested, compared to normal road use. It is not simply about whether a strategy reduces the effectiveness of emissions control outside of testing conditions.

Which car manufacturers were involved in this specific High Court trial?

The trial examined 20 sample vehicles from Mercedes-Benz, Renault, Nissan, Ford, and Peugeot and Citroen. The wider legal action involves many more manufacturers.

Did the judge find that all car manufacturers used illegal devices?

No, the High Court found that most of the strategies examined in the sample vehicles did not constitute prohibited defeat devices. However, one strategy in Mercedes cars (removed in 2015) and another in some Peugeot-Citroen vehicles were identified as non-compliant.

What are the next steps in this legal case?

A further trial is scheduled for October this year. This trial will determine the consequences of any actionable breaches found in the recent ruling and address issues related to potential damages or other remedies for the affected motorists.

The Road Ahead for Emissions Litigation

This High Court ruling marks a pivotal, though not definitive, moment in the ongoing battle over vehicle emissions. While it offers a degree of clarity for manufacturers on the legal definition of a "defeat device," the partial findings against Mercedes and Peugeot-Citroen, combined with the claimants' intention to continue their fight, suggest that the saga is far from over. The upcoming trial in October will be critical in shaping the financial implications and potential compensation for affected motorists. Moreover, the broader implications for the automotive industry's approach to emissions testing, regulatory compliance, and consumer trust will continue to unfold, keeping environmental performance firmly in the spotlight for car buyers and policymakers alike.

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High Court Rules Major Car Firms Largely Cleared in Emissions Cheating Claims, Legal Battle Continues