Understanding Your MOT Results

An MOT result is not a simple pass or fail. The DVSA records five distinct outcomes, and each one places a different legal obligation on you as the driver. Understanding the difference between an advisory, a minor defect, and a major defect is the difference between driving away legally and driving away with a vehicle that could land you a fine, penalty points, or worse.

What are the five MOT result types and what does each one mean?

When the tester finishes your MOT, they record one of five official outcomes. Each has a specific legal meaning and a different practical consequence for you.

The first three results are all passes. The last two are failures. That is the core distinction to remember.

What is the difference between an advisory and a minor defect?

This is the most common source of confusion. Both an advisory and a minor defect appear on a pass certificate, so many drivers assume they are the same thing. They are not.

An advisory is the tester noting something that is not currently a defect but could become one. For example, a tyre with 2mm of tread is legal but will soon need replacing. An advisory is a heads-up, not a failure point.

A minor defect is a specific item that does not meet the full standard but poses no immediate safety risk. For example, a slightly deteriorated brake hose that is still functioning correctly. The vehicle still passes, but the defect is formally recorded on the MOT certificate.

The practical difference is small: both require you to act, but neither requires an immediate retest. The confusion arises because a minor defect is technically a failure item that the DVSA has decided should not fail the vehicle. It sits between an advisory and a major defect in severity.

What does a "dangerous" result mean and why can you not drive away?

A dangerous defect means the tester has judged that the vehicle poses an immediate threat to road safety or the environment. Examples include a severely corroded brake pipe, a tyre with cords exposed, or a steering component that is about to fail.

When you receive a dangerous result, the law is clear: you must not drive the vehicle on a public road. There is no grace period and no exemption for driving it home. The only legal way to move it is on a trailer or transporter.

If you drive a vehicle with a dangerous defect, the penalties are severe. You can face a fine of up to £2,500, three penalty points on your licence, and a possible driving ban. The police do not need to stop you for a separate offence; the dangerous defect itself is the offence.

How long do you have to fix a major defect and get a retest?

When your vehicle fails with a major defect, you need to have it repaired and retested. The retest rules are straightforward but time-sensitive.

If you leave the vehicle at the test centre for the repair and retest, the retest is free. You can also take the vehicle away, have it repaired, and return it to the same test centre within 10 working days. In that case, the retest is also free, provided the repair was carried out on the items that caused the failure.

If you return after 10 working days, or take the vehicle to a different test centre, you will have to pay for a full MOT test again. The test fee for a car is capped at £54.85, so a retest after the free window costs the same as a new test.

There is one important nuance: if the vehicle failed on a dangerous defect, you cannot legally drive it to the repair garage. You must arrange for the repair to happen at the test centre or transport the vehicle there.

How do you read the MOT history of a car you are thinking of buying?

Before you buy a used car, you should run a full MOT history check. The DVSA records every MOT result for vehicles tested since around 2005, and that history is a goldmine of information.

Start by looking at the overall pattern. A car that has passed every year with no advisories is a good sign. A car that fails regularly, or accumulates multiple advisories each year, suggests it has not been well maintained.

Pay particular attention to repeated advisories on the same item. If the same component, such as a brake disc or a suspension arm, appears as an advisory year after year, the owner has been ignoring it. That means the component has been deteriorating for months or years, and you will likely face a significant repair bill shortly after purchase.

Also check the mileage recorded at each MOT. The mileage history should show a steady, logical progression. If a car shows 60,000 miles one year and 55,000 the next, that is a red flag for clocking. You can cross-reference this with a mileage check to see the full trail.

What do repeated advisories on the same item tell you?

Repeated advisories are the single most informative part of an MOT history. They tell you how the previous owner treated the car.

A single advisory on, say, a slightly worn tyre is normal. That same advisory appearing for three consecutive years means the owner never replaced the tyre. They drove on it until it became a major defect or until they sold the car.

Corrosion advisories are particularly telling. Structural corrosion does not improve. If an advisory mentions corrosion on a subframe or suspension component, and it appears again the following year, the corrosion is progressing. By the time you buy the car, that component may be close to failing its next MOT.

When you see repeated advisories, factor the cost of fixing them into your offer. The seller may not have addressed them because they knew the car was nearing the end of its economic life. You should also check whether the car has been flagged as a write-off, as that would explain persistent structural issues.

What should you do if your own car fails its MOT?

If your car fails, you have three options. First, you can have the repairs done at the test centre and get a free retest. Second, you can take the car away, have it repaired elsewhere, and return within 10 working days for a free retest. Third, you can decide the repairs are not economically viable and scrap the car.

Before you authorise any repairs, ask the test centre for a written estimate. You are not obliged to have the work done at the test centre, and you are allowed to shop around. If you do take the car away, remember that driving it with a major defect is only legal if you are driving directly to a pre-booked repair appointment or to another MOT test. Driving it for any other purpose is illegal.

If the failure was for a dangerous defect, you cannot drive it at all. You will need to arrange recovery to a garage.

Once the repairs are complete and the car passes its retest, you will receive a new MOT certificate with the original expiry date preserved, provided the retest happens before the old certificate expires. This is why it is worth getting the test done up to one calendar month minus a day before the expiry date: you keep the same renewal date and do not lose any time.