Does a 2018 diesel at Euro 4 qualify for Cologne?

Yes. The green Plakette requires diesel to reach Euro 4, or Euro 3 with a retrofitted particulate filter, and this car meets that floor. It qualifies for the sticker, which then has to be displayed.

What is the fine for driving in without a sticker?

EUR 100, as a flat payment. The Flensburg penalty point that once accompanied it was abolished in 2014, so there is no licence consequence, but a compliant car without the sticker is still fined.

Where do I buy the Plakette, and what does it cost?

EUR 5-15, from a vehicle registration office, an approved test centre such as TÜV or DEKRA, or an authorised online seller before you travel. It is a one-off purchase that stays valid for the life of the vehicle.

Do foreign-registered cars need one?

Yes. There is no exemption for foreign plates. Order the sticker online in advance with a copy of the registration document showing the emission class, since it is fixed to the windscreen rather than registered against a plate.

Which vehicles get in without a green sticker?

Electric and hydrogen vehicles, historic cars on an H-plate, emergency vehicles and military vehicles. An ordinary Euro 4 diesel takes the sticker route.

Cologne 2026: A 2018 Euro 4 Diesel Takes Green Plakette

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

Cologne’s Umweltzone runs on the green Umweltplakette, pollutant group 4, which a diesel reaches from Euro 4 — exactly where this 2018 car sits. The sticker is a one-off EUR 5-15; entering without one is a flat EUR 100.

Can your car enter Cologne?

Enter your vehicle's fuel + Euro class → instant verdict for Cologne (Umweltzone). Fine if wrong: EUR 100.

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Can a diesel Euro 4 car enter Cologne?

Yes. A diesel Euro 4 vehicle registered in 2018 meets Cologne’s Umweltzone standard, which requires a minimum of Euro 4 for diesel vehicles. You are allowed to drive into the zone.

Qualifying and being admitted are two different steps, though. Germany checks the sticker, not the logbook: the car has to carry the green Plakette on its windscreen, and a compliant car without one is fined exactly like a non-compliant one.

Order the sticker from the official Umweltplakette portal or buy it at a registration office or test centre on arrival. Resellers charge a markup for the same document.

The two fuels take different routes to the same sticker

Cologne has been at the green stage since 1 July 2014, and the green sticker means pollutant group 4. For diesel that is Euro 4, or Euro 3 with a retrofitted particulate filter. For petrol it is simply a regulated catalytic converter, which every Euro 1 car and newer has. The practical consequence surprises people: a tidy petrol car from the early 1990s can carry a green sticker that a mid-2000s diesel cannot.

What this car needs before the trip

Buy the green Plakette, EUR 5-15, and fix it to the windscreen. It is bought once and never renewed.
Have the registration document to hand when ordering, since the seller reads the emission key from it.
Remember there is no foreign-plate exemption. The sticker is a windscreen item, not a plate registration, so it has to travel with the car.

If the sticker does not happen in time

Park and ride. Sites sit outside the zone boundary with a tram or S-Bahn connection into the centre, for a few euros a day.
Buy on arrival. Test centres and registration offices sell the sticker over the counter, which is faster than most people expect.
Check the exemptions. Electric and hydrogen vehicles, H-plate historic cars, emergency and military vehicles are admitted without one.

Quick compliance checklist for Cologne

✅ Confirm the Euro class on the Certificate of Conformity, not the model year
✅ Diesel qualifies from Euro 4, or Euro 3 with a retrofitted particulate filter
✅ Buy and display the green Plakette, EUR 5-15, before entering
✅ The zone runs around the clock, checked by police spot checks and cameras
✅ A flat EUR 100 applies for entering without the sticker, with no licence point attached