Diesel Emissions Claim Calculator UK 2026/27

What this diesel emissions claim calculator does

If you bought or financed a diesel car in the UK, you may have been affected by what is widely called the "dieselgate" scandal – the use of so-called defeat devices that made engines look cleaner in official tests than they were on the road. This free tool gives you a quick, plain-English estimate of the compensation you might receive if a claim succeeds, and a simple eligibility check based on your car's make, the price you paid and the year it was registered. It is built for ordinary drivers who want a realistic ballpark before they decide whether to look into a claim – not a quote, a promise, or legal advice. Because the main court case has not yet been decided, no figure here is guaranteed; the numbers are planning estimates only, and every case is different.

How the calculator works

The estimate is deliberately conservative and is built from three things you enter:

• Manufacturer – we check your make against the carmakers named in the ongoing UK group litigation. Volkswagen Group cars are flagged separately because their case already settled in 2022.
• Price you paid – we apply an indicative band of roughly 5% to 15% of the purchase price, which reflects how claims are often framed as a share of what the car was worth.
• Year registered – the litigation mainly covers diesels from the Euro 5 and Euro 6 era (around 2009 to 2020), so cars outside that window are flagged as less likely to qualify.

The result is then kept inside the £1,000 to £10,000 range that claims firms commonly quote, and anchored to a real benchmark: Volkswagen's 2022 out-of-court settlement paid £193 million to 91,000 UK drivers, an average of about £2,100 each before legal costs. Think of the output as "a sensible ballpark", not the exact sum any individual would receive.

What is the diesel emissions (dieselgate) scandal?

The scandal first broke in September 2015, when the US Environmental Protection Agency accused Volkswagen of fitting software that could detect when a car was undergoing an official emissions test. During the test, the software switched on systems that lowered output of nitrogen oxides (NOx) – gases linked to respiratory illness. On the road, those systems were dialled back to improve performance and economy, so the cars emitted far more pollution in everyday use than the official figures suggested. VW later admitted the devices were fitted to around 11 million cars worldwide and has paid out the equivalent of more than £27 billion globally, mostly in the United States.

In the UK, the issue moved through the courts. In 2020 the High Court ruled that Volkswagen had used defeat devices in breach of EU rules, and in 2022 VW settled a group claim out of court for £193 million. Attention then turned to other manufacturers. The umbrella case – the Pan-NOx Emissions Group Litigation – is now described by lawyers as the largest class action in English and Welsh legal history, potentially involving up to 1.6 million car owners and, on some estimates, worth several billion pounds.

Which cars and makes are affected?

The litigation covers diesel cars and vans broadly from the Euro 5 and Euro 6 period (about 2009–2020). In October 2025, the High Court began a lead trial against five manufacturers chosen to be tried first: Mercedes-Benz, Ford, Peugeot/Citroën (Stellantis), Renault and Nissan. These five alone are facing around 880,000 claimants, and a further nine carmakers face similar claims depending on the outcome. Importantly, all of the manufacturers deny the allegations and argue their engine systems were lawful and technically justified.

Volkswagen Group brands – VW, Audi, SEAT and Škoda – were largely dealt with in the earlier, separate case that settled in 2022, so a new VW-badged EA189 claim may already be closed or out of time. Other well-known names linked to the wider claims include BMW/MINI, Vauxhall/Opel, Fiat, Jaguar Land Rover, Hyundai, Kia and Volvo. If your diesel falls in the right age band and carries one of these badges, it is worth a free eligibility check.

How much diesel emissions compensation could you get?

Honestly: nobody can promise a figure yet. The main UK case has not been decided, with a High Court judgment not expected until summer 2026, and even then a separate trial would set the actual amount of any compensation. So treat every number – including ours – as an estimate.

The most useful real-world anchor is the Volkswagen settlement: £193 million split between 91,000 drivers, roughly £2,100 each on average before legal deductions. Claims firms handling the wider litigation typically talk about a range of £1,000 to £10,000 per affected vehicle, with the higher end reserved for more expensive cars or where someone owned several affected vehicles. The eventual payout (if any) will depend on the court's findings, the value of your car, how long you owned it, and the deductions taken by the firm running your claim. Be cautious of anyone advertising large "guaranteed" sums – that is not how group litigation works.

Worked example

Suppose David bought a 2015 Ford diesel for £18,000 and still owns it. The calculator applies the indicative band – 5% to 15% of £18,000 = £900 to £2,700 – and lifts the bottom of the range to the £1,000 floor commonly quoted, giving an estimate of about £1,000 to £2,700, with a mid-point near £1,850. Because Ford is one of the five lead defendants and 2015 sits inside the Euro 5/6 window, David is told he may be able to join a claim. The tool reminds him that this is only an estimate, that Ford denies the allegations, and that he should confirm his position with a regulated solicitor before doing anything. If David had instead owned a 2008 model, the calculator would flag it as likely outside the typical window; if it were a VW, it would point him to the already-settled 2022 case.

Who qualifies to claim?

There is no official eligibility calculator, but in practice the firms running these claims look for a few things:

• A diesel car or van – petrol and hybrid vehicles are not part of the NOx claims.
• The right age band – broadly registered between around 2009 and 2020 (the Euro 5/Euro 6 era).
• An affected manufacturer – one of the makes named in the group litigation.
• Ownership in the UK – whether you bought outright, on PCP, on hire purchase, or leased. You do not have to still own the car; previous owners can usually claim for the period they owned it.

You generally do not need to prove the technical engine details yourself – that is the job of the lawyers and experts. What helps is your V5C logbook, the registration number, and any purchase or finance paperwork showing when you owned the vehicle.

No win, no fee – and the costs to watch

Most diesel emissions claims are run on a no-win-no-fee (conditional fee) basis, meaning there is usually nothing to pay up front and nothing to pay if the claim fails. If it succeeds, the law firm takes a success fee, often up to around 30–50% of the compensation, and there may be an insurance premium too. That is why the amount that reaches you can be noticeably lower than the headline estimate. Always read the agreement carefully so you understand exactly what would be deducted, and remember you are never obliged to use a paid claims company – you can also approach a regulated solicitor directly.

Common mistakes to avoid

• Treating an estimate as a promise. Until the court rules, no figure is guaranteed – not even the VW-based benchmark.
• Assuming you can't claim because you sold the car. Former owners can usually still join for their ownership period.
• Signing up with more than one firm. Joining several claims for the same car can cause problems – pick one regulated provider.
• Ignoring the success fee. A 30–50% deduction materially changes what you actually receive.
• Paying an upfront "admin" fee. Genuine no-win-no-fee claims do not require money up front; be wary of cold calls and texts.
• Leaving it too late. Claims have deadlines; if you think you qualify, get a free check rather than waiting.

Frequently asked questions

Sources: Pan-NOx Emissions Group Litigation status, lead-defendant trial and timing reported by the Courts and Tribunals Judiciary (High Court, King's Bench Division) and contemporaneous reporting of the October 2025 trial; Volkswagen's 2022 settlement (£193m to 91,000 UK drivers) and the 2020 High Court defeat-device ruling are matters of public record. Vehicle and emissions standards background from the DVSA / GOV.UK. This page is general information, not legal or financial advice.