Transport for London runs the official ULEZ vehicle checker and it is free to use. Enter a registration and it tells you whether that exact vehicle meets the standard or faces the daily charge. The broad rule is Euro 4 for petrol cars and Euro 6 for diesel cars, but the official checker is the only answer enforcement acts on.
ULEZ ignores fuel economy, CO2 figures and the badge on the boot. It looks at one thing: the emissions standard the vehicle was type approved to when it was built.
| Vehicle type | Minimum standard | Rough age guide |
|---|---|---|
| Petrol car, van or minibus | Euro 4 | Generally first registered from 2006 |
| Diesel car, van or minibus | Euro 6 | Generally first registered from September 2015 |
| Motorcycle, moped or motor tricycle | Euro 3 | Generally first registered from 2007 |
| Lorry, bus or coach | Euro VI | Covered by the separate London LEZ, not ULEZ |
The years in that table are a guide, not the rule. Type approval happens before a car reaches a showroom, so a diesel first registered in October 2015 can still be a Euro 5 vehicle, and a handful of petrol cars built between 2001 and 2005 already met Euro 4. Two cars of the same model and year can land on opposite sides of the line.
Age has one other effect. A vehicle over 40 years old and taxed in the historic class is exempt, under the same rolling 40 year rule that takes it out of VED. Electric vehicles sit outside the charge, and some vehicles in the disabled and disabled passenger tax classes have had grace periods, so check your own case rather than assuming.
Knowing the fuel type, engine size, first registration date and recorded CO2 figure for the plate makes the rest of it far more obvious. A car spec check pulls that recorded specification from official records, which matters when an advert claims "2016 Euro 6" and the paperwork says something else. If the car turns out to be an import, expect more legwork on the emissions evidence.
Enter the registration and get the key facts before you commit to the car.
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English Clean Air Zones run in classes, A to D, and the class decides which vehicles pay. Only a class D zone charges private cars. Birmingham and Bristol have run class D schemes. Zones in cities such as Bath, Portsmouth, Sheffield, Bradford and Tyneside target buses, coaches, lorries, vans and taxis instead, so a non-compliant diesel that costs money in London can drive through them for nothing. Oxford also runs a small Zero Emission Zone in its city centre, which works differently again.
Where cars are charged, the standards match London: Euro 4 petrol, Euro 6 diesel. The boundaries do not. A zone can stop at a ring road, and the difference between paying and not paying can be a single junction. Schemes also get changed, paused and switched off, so confirm the current position on the GOV.UK Clean Air Zones page before you plan a route.
Glasgow, Edinburgh, Dundee and Aberdeen operate Low Emission Zones. The Euro standards are broadly the same, but the mechanism is not. A Scottish LEZ is not a charging zone. Non-compliant vehicles are simply not allowed in, and driving one into the zone triggers a penalty charge that doubles for each repeat breach within a set period. Each city publishes its own boundary and exemptions on the official Scottish LEZ site. Wales and Northern Ireland do not run charging zones of this kind at present.
What the report does cover is the history no free tool shows in one place: outstanding finance, insurance write-off markers, police stolen markers, the mileage recorded at every MOT and any discrepancies, full MOT test history with advisories, keeper history with dates, plate transfers, colour changes, import and export markers, scrapped markers, tax status and the recorded specification. A full car history check answers the questions that cost real money, and the free MOT history fills in part of the mechanical picture.
First, write down the zones you actually drive into. Plenty of buyers talk themselves out of a good car over a zone they enter twice a year, when the charge on those two trips costs less than the price gap to a compliant car.
Second, run the plate through the official checker before you view the car, not after. It takes seconds and costs nothing.
Third, treat compliance as one line on a longer list. A compliant Euro 6 diesel with outstanding finance on it is a far more expensive mistake than a non-compliant petrol you take into town four times a year. Work through the rest with a used car check before you hand over any money.
Hidden finance and write-offs won't show up on a test drive.
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