DVSA publishes 2025 Market Surveillance Unit programme results

DVSA has published its Market Surveillance Unit (MSU) 2025 programme and emissions testing results.

The MSU inspects vehicles, trailers, parts, and equipment to make sure they are safe for people to buy and use. It also checks that they meet current and relevant environmental standards.

Emissions testing

DVSA aims to check a representative selection of the most popular vehicle types used on UK roads. In 2025, we carried out tests on:

diesel cars

petrol cars

light-duty vans

hybrid cars (self-charging hybrid)

motorcycles

Read the emissions testing report here: Vehicle Market Surveillance Unit emissions testing results, 2025 – GOV.UK

Vehicle and component testing

The report covers several products, including:   

aftermarket emissions components

agricultural and forestry vehicles

motorcycle exhaust systems and silencers

electrically assisted pedal cycles (EAPC) and EAPC conversions

electric and petrol-powered scooters

advanced driver assistance systems (ADAS)

Taking action

When DVSA finds evidence of unsafe or illegal vehicles, products or parts it can:

offer advice and guidance

issue warnings

issue recall notices

issue fines (called civil penalties)

report the individual or business for consideration of prosecution

The report provides details of the action taken in 2025, including testing 9 popular aftermarket catalytic converters (CAT) and diesel particulate filters (DPF).

Read the vehicle and component testing programme report: Vehicle Market Surveillance Unit programme results, 2025 – GOV.UK