The quickest way to know if a car is ULEZ compliant is to enter its registration number into Transport for London's own vehicle checker on the TfL website. It tells you whether that exact vehicle meets the Ultra Low Emission Zone standards. As a rough guide, most petrol cars first registered from around 2006 and most diesel cars first registered from September 2015 meet the standard. A rule of thumb is not proof, though, so always confirm by reg plate.
What ULEZ compliance actually means
ULEZ compliance is based on your vehicle's exhaust emissions, which are described by Euro standards. It is not about age, value or how clean the car looks. The minimum standards for cars and vans are:
- Petrol cars: Euro 4, generally those first registered from around 2006 onwards.
- Diesel cars: Euro 6, generally those first registered from September 2015 onwards.
- Motorcycles: Euro 3, generally those first registered from around 2007 onwards.
- Fully electric vehicles: exempt, because they have no exhaust emissions.
The ULEZ covers all London boroughs and runs 24 hours a day, every day except Christmas Day. If your vehicle does not meet the standard and is not exempt, you pay a daily charge, currently £12.50. Check TfL for the latest figure, as charges and rules can change.
Step-by-step: how to check a specific car
- Get the registration number. It is on the number plate, the V5C logbook and the advert.
- Use the TfL vehicle checker. Enter the reg and it will tell you whether the vehicle meets the standard.
- Cross-check the details. Make sure the make, model, fuel type and colour shown match the car in front of you.
- Look at the V5C. The date of first registration and fuel type help you sense-check the result.
- Save the result. Take a screenshot or note the date if you are buying, in case the details are queried later.
Why the age rule of thumb can mislead you
Many buyers assume that any diesel from 2015 is fine. That is not always true. Euro 6 was phased in, so some diesels registered before September 2015 meet it and some registered shortly after may not. The same applies to petrol cars around the 2005 to 2006 cut-off. Imported vehicles, modified cars and vehicles with removed or faulty emissions equipment can also behave differently from the standard model.
The fuel type matters too. A hybrid is judged on its engine and emissions standard, not simply on the fact that it has a battery. A plug-in hybrid with a petrol engine that meets Euro 4 or better is usually compliant, but you should still check the actual registration.
Exemptions that may apply
Some vehicles do not pay the ULEZ charge even if they do not meet the standard. These include fully electric vehicles, vehicles in the historic tax class (generally over 40 years old) and certain specialist or disabled-tax-class vehicles. The rules and eligibility are set by TfL, so read their guidance rather than assuming an exemption applies.
What happens if you get it wrong
If you drive a non-compliant vehicle in the zone and do not pay the daily charge, you can receive a Penalty Charge Notice. At the time of writing, this is £180, reduced to £90 if paid within 14 days. Cameras read number plates automatically, so being unaware is not a defence. If you buy a car without checking and then drive into London regularly, the cost can add up quickly.
ULEZ is not the only clean air zone
London is not the only place with emissions rules. Several UK cities operate Clean Air Zones or Low Emission Zones, and each has its own standards, charges and boundaries. Glasgow and Edinburgh have Low Emission Zones in Scotland, and some English cities charge certain vehicles. A car that is ULEZ compliant is not automatically exempt elsewhere, so check the local scheme if you drive in other cities.
What to check before you buy a used car
If you are buying a used car for London driving, ULEZ status is only one part of the picture. A compliant car can still have serious hidden problems. Before you hand over any money, it is worth checking:
- MOT history: look for repeated emissions failures, advisories about the exhaust or catalytic converter, and any diesel particulate filter issues.
- Mileage: compare the mileage across MOT records to spot odd jumps or signs of clocking.
- Insurance write-off markers: check whether the car has been recorded as Cat A, B, S or N on the MIAFTR database.
- Stolen marker: see whether the vehicle is flagged as stolen on the Police National Computer (PNC).
- Outstanding finance: a car with finance still owing may not legally be yours to keep.
- Previous keepers: many owners in a short period can be a warning sign.
You can run the registration through motorpeek.com to see the vehicle's history and check these points before you commit. Use the TfL checker alongside it to confirm the ULEZ result. Motorpeek is an independent service and is not affiliated with TfL, the DVLA or any government body.
Bottom line
Do not rely on the car's age or on what the seller tells you. Check the registration with TfL, confirm the fuel type and first registration date on the V5C, and look at the car's wider history before buying. That takes a few minutes and can save you a daily charge, a fine or an expensive mistake.
Frequently asked questions
Can I check if my car is ULEZ compliant with just the number plate?
Yes. Enter the registration number into the vehicle checker on the Transport for London website and it will tell you whether the vehicle meets the ULEZ standard. You only need the reg plate, though it is worth checking that the make and model shown match your car.
What years of petrol and diesel cars are ULEZ compliant?
As a general guide, petrol cars first registered from around 2006 (Euro 4) and diesel cars first registered from September 2015 (Euro 6) meet the standard. There are exceptions, because the Euro standards were phased in, so always confirm a specific vehicle by its registration.
What happens if I drive a non-compliant car in the ULEZ without paying?
You can be sent a Penalty Charge Notice, which is currently £180, reduced to £90 if paid within 14 days. Cameras read number plates automatically. The daily charge is currently £12.50, so check the TfL website for the latest amounts.