What do minor, major and dangerous mean on an MOT certificate?
The five outcomes an MOT can record, which of them fail the test, which of them stop you driving, and how an advisory differs from a minor defect.
- Difficulty
- beginner
- Time
- 12 min
- Read
- 5 min
- Safety
- warning
Short answer
Since 2018 the MOT records defects in three grades plus advisories. Dangerous and major both fail the test; minor passes but is recorded on the certificate; an advisory is a note that something will need attention. The distinction that matters most is dangerous, because that means the car must not be driven at all until it is fixed — not even home, and not even if the old certificate has not expired.
Before 2018 an MOT was pass, fail or advisory, and everyone understood it. The current system was introduced to bring the test into line with an EU roadworthiness directive and it added a middle tier, which is where the confusion comes from. Two things get conflated. The first is whether the car passed, which is decided by whether any dangerous or major defect was recorded. The second is whether you may lawfully drive it, which is a separate question governed by whether a dangerous defect was recorded and whether a valid certificate exists. A car can pass with a list of minor defects and advisories as long as your arm, and a car can fail on a single item and still be driveable to a repair.
Safety
Step by step
- Read the outcome first, then the list.The certificate or the online record states a pass or a fail. Everything below that is detail. The presence of items on the list does not by itself mean the car failed — minor defects and advisories both appear on a passed test.
- Treat dangerous as an absolute stop.A dangerous defect is one that presents a direct and immediate risk to road safety or a serious environmental impact. The car must not be driven until it is repaired. That applies even if your existing MOT certificate still has months to run, because driving a vehicle in a dangerous condition is a separate offence.
- Understand major as a fail you can sometimes drive away from.A major defect may affect the vehicle's safety, put other road users at risk or have a significant environmental impact, and it fails the test. If your previous certificate is still valid and the defect is not dangerous, you may generally drive the car away — for example to a garage. Once the old certificate has expired, you may only drive to a pre-arranged repair or test appointment.
- Read minor as a pass with a note.A minor defect does not significantly affect safety or the environment. The car passes, but it is recorded, and it is worth reading as a signal — a minor defect this year is very often a major one next year.
- Read advisories as a maintenance forecast.An advisory is the tester telling you something is deteriorating but is not yet a defect. Brake pads at the end of their useful life, tyres approaching the limit, corrosion beginning. This is genuinely useful and free information about what the car will cost you over the next twelve months.
- Check whether anything was recorded as a pass with rectification.If the tester finds a defect and it is fixed there and then before the test finishes, it can be recorded as rectified. That still appears on the record, and it is worth knowing what was done rather than just seeing a pass.
- Look the record up online rather than relying on the paper.The full MOT history for any vehicle is published free by registration on GOV.UK, including every test, every defect, every advisory and the recorded mileage. It is permanent, it is more reliable than a filed certificate, and it is the single most useful free tool when buying a used car.
- Use last year's list as this year's preparation.Advisories and minor defects are a written prediction of next year's failures. Dealing with them at a service, when the car is already in and the wheels may already be off, is consistently cheaper than dealing with them as a failure and a retest.
Common mistakes
- Driving a car with a dangerous defect because the old certificate has not run out — The certificate does not make a dangerous vehicle lawful. Driving in a dangerous condition is a separate offence carrying penalty points, and an insurer will take a very close interest after an incident.
- Ignoring advisories because the car passed — They are the tester's written forecast of next year's failures. Acting on them at a service costs less than acting on them as a failure, a repair and a retest.
If it doesn't work
Passed the MOT but the list is long
Cause: Minor defects and advisories, none of which fail — Fix: The car is legal. Read the list as a to-do list ordered by cost and urgency, and ask the garage which items are getting close to becoming failures.
Failed on a dangerous defect and the garage will not release the car
Cause: They are following the rules — Fix: They are entitled to refuse to let you drive away a vehicle recorded as dangerous. Arrange the repair or a recovery. Arguing about it does not change the record, which is already on the national system.
Failed but the old certificate is still valid
Cause: A major defect, not a dangerous one — Fix: You may generally drive it, including to another garage, provided the defect is not dangerous and the vehicle is otherwise roadworthy. Do not treat that as permission to leave it unrepaired.
Advisory for corrosion near a suspension mounting
Cause: Structural corrosion beginning in a prescribed area — Fix: Take this one seriously. Corrosion advisories in prescribed structural areas become major or dangerous defects quickly, and welding costs escalate fast on an older car.
Same advisory appears three years running with no change
Cause: Slow deterioration, or different testers reading it differently — Fix: Ask the tester to show you. Testers do vary in judgement at the margins, and seeing the item yourself tells you whether it is genuinely stable.
Warning light on the dashboard failed the test
Cause: Several warning lamps are testable items — Fix: The engine management, ABS, airbag, brake, tyre pressure monitoring and steering warning lamps are all checked on cars fitted with them. Fix the underlying fault before the test rather than after.
Questions people ask
Can I drive to a garage after failing an MOT?
If the previous certificate is still valid and no dangerous defect was recorded, generally yes. If the certificate has expired, you may drive only to a pre-arranged MOT test or to a pre-arranged repair. With a dangerous defect recorded, you may not drive it at all.
Does a minor defect need fixing?
Not to be legal — the car passed. It should be fixed, because minor defects are on a trajectory, and the garage has already told you where that trajectory leads. Deal with it before it becomes a fail.
Where can I see a car's full MOT history?
GOV.UK publishes the complete MOT history free by registration number, covering every test, all defects and advisories, and the mileage recorded at each test. You do not need to own the car to look, which makes it invaluable before buying one.