What is checked in an MOT?
An MOT is a road-safety and emissions check, not a mechanical health check. Here is exactly what the tester looks at, and what they don't.
What does an MOT test cover?
The MOT checks that the safety-related and environmental parts of your car meet the legal minimum on the day of the test. The tester works through a set list in the DVSA inspection manual and does not take the engine or gearbox apart. These are the main areas checked.
| Area | What the tester checks |
|---|---|
| Lights | Headlamps, indicators, brake, fog and number-plate lights, and headlamp aim |
| Brakes | Pad and disc condition, braking efficiency on a rolling road, and balance |
| Tyres & wheels | Tread depth (at least 1.6mm), condition, correct size and secure wheels |
| Steering & suspension | Play, worn joints, springs, shock absorbers and gaiters |
| Seat belts | Condition, security and that they lock and retract |
| Exhaust & emissions | Leaks, security and exhaust gas within the limit for the engine |
| Visibility | Wipers, washers, mirrors and the driver's view of the road |
| Body & structure | Corrosion, sharp edges and secure panels in key areas |
What is NOT checked in an MOT?
An MOT does not check the condition of the engine, clutch or gearbox, and it is not a substitute for a service. It says nothing about how long a part will last, only whether it meets the standard on the day. A car can pass its MOT and still need repairs, and passing does not mean the car is roadworthy for the whole year.
What fails most often?
Lighting is the single most common MOT failure, followed by suspension and brakes. Most of the top failures are cheap and quick to fix before a test.
Sources: MOT inspection manual: cars and passenger vehicles, DVSA ยท Getting an MOT, gov.uk