Is a 2018 diesel too old for Brussels?

At Euro 4, yes. The LEZ diesel floor rose to Euro 6 on 1 January 2026 following a Constitutional Court ruling of September 2025, and this car sits two classes below it. No registration or paperwork closes a Euro gap.

What is the fine, exactly?

EUR 350 for a vehicle that does not meet the Euro standard. A first offence brings a warning letter, with the fine able to follow about three months later, and since 1 July 2026 it can be re-issued over a twelve-month period while the vehicle stays non-compliant.

Is there a day pass for a non-compliant car?

Brussels sells a day pass at EUR 35, capped at 24 per vehicle per year. It is the only route into the zone for a car that cannot meet the standard, and the cap is what makes it a stopgap rather than a plan.

Do compliant foreign cars have to do anything?

Yes — register free at lez.brussels, valid five years, either before entering or within five days of doing so. Vehicles registered in the Netherlands are exempt from registering. An unregistered but compliant foreign car is fined EUR 150 in its own right.

Is the standard about to change again?

Yes. From 1 January 2028 diesel Euro 6b, 6c and 6d-TEMP and petrol Euro 3 are refused, which lifts the petrol floor to Euro 4 and the diesel floor to Euro 6d. A Euro 4 diesel is outside the zone under both the current and the coming rule.

Brussels 2026: Euro 6 Floor Locks Out a Euro 4 Diesel

Checked against official sources 20 Sep 2026 · Next review 2026-12-19

No. Brussels raised its LEZ diesel minimum to Euro 6 on 1 January 2026, so a 2018 diesel Euro 4 is refused across all 19 communes, at all hours. A non-compliant vehicle is fined EUR 350, after a warning letter for a first offence.

Can your car enter Brussels?

Enter your vehicle's fuel + Euro class → instant verdict for Brussels (LEZ). Fine if wrong: EUR 350 (non-compliant vehicle); EUR 150 (foreign vehicle not registered, even if compliant); EUR 25 (incorrect registration data). Warning letter for the first offence..

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Can a diesel Euro 4 car enter Brussels?

No. Brussels tightened its LEZ diesel floor to Euro 6 on 1 January 2026, following a Constitutional Court ruling of September 2025 that also banned Euro 2 petrol, and this 2018 diesel Euro 4 sits two classes below the new line. ANPR cameras read the plate at any hour, in any commune.

Three fines, and which one applies here

The portal publishes three amounts, and they are not a range:

EUR 350 — a vehicle that does not meet the Euro standard. This is the one that applies to a Euro 4 diesel.
EUR 150 — a foreign vehicle that was never registered, even when it is compliant.
EUR 25 — incorrect information given during registration.

A first offence brings a warning letter rather than a bill, with the fine able to follow around three months later. Since 1 July 2026 that EUR 350 can be re-issued over a twelve-month period while the vehicle remains non-compliant, so a long stay compounds the exposure rather than settling it once.

Brussels does not lean on EU enforcement machinery to reach a foreign keeper. It uses commercial address-tracing instead, since Directive 2015/413 covers only eight road-safety offences and emission-zone breaches are not among them.

The routes that do exist

Registration at lez.brussels is free, valid five years, and can be completed before entering or within five days after. It is compulsory for foreign plates — Dutch-registered vehicles being the single exception — but it records a car’s class rather than granting access, so it does nothing for a Euro 4 diesel.

What can get this car in is the day pass at EUR 35, capped at 24 per vehicle per year. Beyond that, the recognised exemptions are electric vehicles and oldtimers of 30 years or more, and a 2018 car is far from either.

What changes on 1 January 2028

The next step refuses diesel Euro 6b, 6c and 6d-TEMP along with petrol Euro 3, lifting the petrol floor to Euro 4 and the diesel floor to Euro 6d. A Euro 4 diesel is outside the zone under both the current rule and the coming one, so nothing about the 2028 date improves this car’s position.

Quick compliance checklist for Brussels

✅ Diesel needs Euro 6 or newer since 1 January 2026; this Euro 4 car does not reach it
✅ Registration is free and mandatory for foreign plates, but it cannot lift a Euro shortfall
✅ A day pass costs EUR 35 and is capped at 24 per vehicle per year
✅ EUR 350 for a non-compliant vehicle, after a warning letter for the first offence
✅ Park and ride outside the ring and take the metro or tram — cheaper than one fine