Mercedes NOx Emissions Claims
Mercedes NOx Emissions Claims
Charles Lyndon represents hundreds of thousands of UK vehicle owners on a no-win, no-fee basis against Mercedes-Benz. Evidence suggests Mercedes-Benz diesel vehicles sold between 2009 and 2018 were fitted with software “defeat devices” that cheated emissions tests. In other words, cars appeared to pass laboratory emissions tests while emitting far higher nitrogen oxide (NOₓ) on the road.
Owners who bought or leased these vehicles may have been misled into paying a premium for cars that did not meet advertised environmental standards.
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Important: Charles Lyndon is not currently accepting new Mercedes Emissions Claims.
If you have already registered a claim with us, please continue to check for updates regarding the ongoing litigation.
The Claim Against Mercedes
- Defeat devices: Mercedes is alleged to have used software in diesel engines to manipulate emission controls during testing.
- Cheated testing: Under test conditions, the cars kept NOₓ output within legal limits, but in normal driving they emitted much higher pollution levels.
- Regulatory breach: As a result, affected vehicles did not comply with EU/UK emissions standards or consumers’ expectations for performance.
How are the Claimants affected?
- Higher pollution: Affected cars likely produced excess NOₓ on the road, worsening air quality and health risks.
- Increased costs: Owners report worse fuel economy than advertised, meaning higher running costs.
- Lower resale: Vehicles requiring recall fixes or software updates may have reduced market value compared to unaffected models.
Latest Litigation Status
The Mercedes Emissions Claim forms part of wider diesel emissions proceedings brought against other leading vehicle manufacturers.
- In May 2023, the High Court granted a Group Litigation Order enabling affected vehicle owners to pursue claims together.
- In October 2025, a significant High Court trial commenced to determine issues relating to the alleged use of prohibited defeat devices.
- The Court has now handed down its judgment following that trial.
Court Judgment
A key judgment has now been issued in the proceedings.
- Read the judgment summary: Pan NOx judgment summary – 100726
- Read the full judgment: Various claimants -v- Mercedes Benz Group AG and others
Frequently Asked Questions
- Can I register a new Mercedes emissions claim with Charles Lyndon? No. Charles Lyndon is not currently accepting new Mercedes Emissions Claims.
- What if I have already registered a claim? If you have already registered a claim, you should continue to monitor updates from the legal team handling your claim.
- Has the Court issued a judgment? Yes. Following the October 2025 trial, the Court has handed down a judgment. Links to both the judgment summary and the full judgment are available above.
Important Notice
Charles Lyndon is not accepting new claims in relation to the Mercedes Emissions litigation. If you have already registered a claim with us or another law firm, please refer to official case updates regarding the progress of the ongoing proceedings.
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If you have any questions about a specific case we are working on, would like to discuss us representing you or want to know more about who we are and what we do, then speak to our team. We will get back to you as soon as possible.
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