A car was impounded following a check carried out on 25 October 2026, avenue des Alliés in Ettelbruck. In its statement of 26 October, the Police grand-ducale said several visible modifications had caught officers’ attention.
The police noted significant defects and components not listed on the registration certificate, including the suspension, exhaust and a rear spoiler. The prosecutor’s office ordered the vehicle to be impounded. The statement does not specify a final penalty or the conditions for the vehicle’s release.
Modifying a part can also mean changing the vehicle’s paperwork
For an owner considering a modification, the key is to check which documents are needed before the work is carried out. The SNCA guide to technical modifications distinguishes between individual modifications and combinations that affect one another’s operation.
It specifically mentions combining wheels and suspension. In this case, a report drawn up by an approved technical service must cover the conformity of the entire combination. Depending on the part concerned, the application may also require a certificate from the professional who carried out the modification, along with the relevant technical reports.
For an exhaust system, the SNCA list requires a report from an approved technical service. For a spoiler or body kit, it also describes an option based on a certificate from the professional, accompanied by technical supporting documents. The document required therefore depends on the specific modification.
The two-month deadline is not a general authorisation to drive
The Mobility Ministry’s FAQ makes an essential distinction. When a modification must be entered on the registration certificate, the vehicle may be driven only with the required supporting documents: a duly completed modification certificate or, in the conditions described by the ministry, a report from an approved technical service.
For a vehicle whose roadworthiness test is still valid and which has these documents, the modification must be entered before the next roadworthiness test, and no later than two months after the report or certificate is issued, according to this FAQ. This deadline should not be understood as allowing any modification to be driven on the road freely for two months.
The SNCA recommends consulting an approved technical service or an automotive professional if in doubt. This check applies to the vehicle and the parts actually fitted; the example of the Ettelbruck check alone does not make it possible to conclude that another car is compliant.
Illustrative photograph, unrelated to the vehicle that was checked: Tbatb, Wikimedia Commons, CC BY-SA 4.0, cropped for display.
