MOT tests are a legal requirement in the UK, designed to ensure vehicles remain safe and roadworthy.
Among the different MOT categories, Class 4 MOTs are the most common, covering the majority of everyday
vehicles.
There is also a closely related Class 4a MOT, which applies to a smaller group of passenger vehicles.
This guide explains what each class involves, the vehicle types included, the requirements, and the costs you can expect.
What Is a Class 4 MOT?
The Class 4 MOT is the standard test most drivers will be familiar with. It applies to a wide range of vehicles, including:
- Passenger cars with up to 8 seats
- Light vans and goods vehicles up to 3,000kg in design gross weight (DGW)
- Motor caravans and dual-purpose vehicles
- Private hire vehicles, such as taxis and ambulances with up to 8 passenger seats
During a Class 4 MOT, examiners check a comprehensive list of components to make sure the vehicle meets DVSA safety and environmental standards. These include:
- Brakes and suspension – ensuring effective stopping power and stable handling.
- Lights, indicators, and signalling equipment – confirming all are functional and correctly aligned.
- Steering and visibility – checking mirrors, wipers, and washers are in working order.
- Tyres and wheels – verifying tread depth (minimum 1.6mm across the central three-quarters) and condition.
- Seatbelts – ensuring they are present, secure, and working properly.
- Emissions and exhaust system – making sure levels fall within legal limits.
- Body structure – inspecting for corrosion or damage that could affect safety.
In short, a Class 4 MOT confirms your vehicle is safe to drive, properly equipped, and compliant with emissions standards.
