High Court Verdict on Diesel Emissions Claims Against Car Manufacturers

The UK High Court has ruled on a massive diesel emissions case, impacting millions of car owners and setting a precedent for future claims.

The UK High Court has delivered a landmark verdict in a massive diesel emissions case, rejecting most claims brought by 1.6 million car owners against major manufacturers. The ruling, which spans 369 pages, has significant implications for the automotive industry and diesel car owners across the country.

The case, often referred to as the dieselgate scandal, centered around allegations that car manufacturers installed prohibited defeat devices—software that enables engines to perform differently during emissions tests compared to real-world driving conditions. The trial, which lasted 15 weeks, focused on 20 vehicles from five manufacturers: Mercedes-BenzFordRenaultNissan and Peugeot-Citroën.

Key Findings of the High Court Ruling

Lady Justice Cockerill’s judgment found that in most instances, the strategies used by manufacturers did not constitute prohibited defeat devices. However, she noted that certain technologies in Mercedes and Peugeot-Citroën vehicles could be considered defeat devices.

The judge emphasized that proving intention to rig a test was necessary and that simply showing reduced effectiveness of emissions-control systems outside testing conditions was not sufficient.

The ruling also highlighted the complexity of emissions testing, stating that none of the approaches to isolating the effect of a particular calibration on nitrogen oxide (NOx) emissions was entirely satisfactory. The judgment suggested that if a different interpretation of defeat device were applied, more devices would be established, including those in the lead manufacturers’ cars.

Reactions from Manufacturers and Claimants

Mercedes-Benz welcomed the ruling, stating that the court had ruled very largely in favor of the manufacturer. However, the company expressed disagreement with the finding that one of its vehicles was non-compliant before a software update in 2015 and is considering an appeal. Stellantis the owner of Peugeot-Citroën is also considering an appeal over the upheld allegations.

Nissan and Renault maintained that their technologies did not constitute defeat devices, while Ford was contacted for comment. Lawyers for the claimants indicated they were considering an appeal, citing a significant divergence between the legal position in Great Britain and much of Europe.

Implications for the Automotive Industry

The verdict comes more than a decade after the initial discovery of Volkswagen’s dieselgate scandal, which revealed that the company had designed car engines to operate differently under test conditions, masking true levels of NOx pollution. The case was brought by over 20 law firms, led by Leigh Day and Pogust Goodhead and marks the largest group action trial in English legal history.

The ruling has sparked mixed reactions from campaign groups and legal experts. Mums for Lungs a campaign group, described the verdict as a setback but emphasized that the scientific consensus on the toxicity of diesel cars remains unchanged. The group called for swift action from the car companies found guilty to remove their vehicles and compensate for their actions.

The Department for Transport acknowledged the High Court’s decision but stated that its investigation into the issue continues. The department emphasized that defeat devices are illegal, misleading for drivers, and can have negative health impacts on the public.