An MOT advisory is a warning, not a fail. Here is what advisories actually mean, how they differ from minor, major, and dangerous defects, and how to decide which ones need fixing this week and which can wait.
Key Takeaways
- Advisories are not set in law. They flag a part that is wearing but has not yet become defective. A pass with advisories is still a pass.
- The four MOT outcome categories are: pass, minor, major, dangerous. Only major and dangerous cause a fail. Minor is a "fix it soon" note that still lets you drive away legally.
- Dangerous defects make the vehicle illegal to drive on the road, including from the MOT bay to the nearest garage. There is no grace period.
- Most advisories are genuine early warnings: brake pad thickness, tyre wear on the inner edge, corrosion near a bracket. Ignoring them is how next year's MOT becomes a fail.
- You can check any UK vehicle's full MOT history, including every advisory ever recorded, free on gov.uk. The history is a better second-hand buying tool than the V5C alone.
Most drivers glance at the MOT pass certificate, see the word "pass", and file it. Then a year later they fail on something that was already on last year's paperwork as an advisory. That pattern is avoidable.
This guide explains what the four MOT outcome categories actually mean, how the 2018 changes reshaped what a tester can record, and how to triage your advisory list so the urgent stuff gets fixed and the genuinely minor stuff does not take up a Saturday morning you did not need to spend.
If you are about to put a vehicle in for its MOT and want to know what the tester will be looking at, the companion MOT month preparation guide walks through the most common avoidable failures. Use this one afterwards, when the certificate comes back.
What are the four MOT defect categories?
The MOT test has four possible outcomes for any individual check item: pass, minor, major, and dangerous. Pass and minor both let the vehicle leave with a valid MOT. Major and dangerous cause a fail. Advisories sit alongside those categories, recording a component that is not defective yet but is worth watching. The categorisation was introduced in May 2018 and has been in place across every UK MOT since.
Pass. The component meets the required standard. No note appears on the certificate for that item.
Minor defect. There is a defect, but it is not severe enough to fail. You still get a valid MOT certificate. The note on the certificate is a flag that the item should be fixed at the next opportunity.
Major defect. The vehicle fails. The defect must be fixed and the vehicle re-tested before it can be driven on the road under that MOT.
Dangerous defect. The vehicle fails AND must not be driven on the road at all, including to another garage for repair. Driving a vehicle with a dangerous defect is an offence separate from having no MOT.
Advisory. Not a defect. The tester is recording that a component is wearing and will likely fail at or before the next test. Advisories are not set in legislation and do not affect the certificate.
That last distinction is the one people miss. A minor defect is the law saying "you have got a problem but we are not going to fail you this time". An advisory is the tester saying "here is what is going to break next". Both go on the permanent record. Neither stops you driving.
So what does "advisory" really mean?
An advisory is the MOT tester's note that a part is not yet defective but is wearing close enough to the limit that it is likely to become defective during the next 12 months. The test has no power to fail a vehicle on an advisory, and advisories are not grounded in legislation. But they are recorded against the vehicle's permanent MOT history on gov.uk, which is how a thorough buyer spots a car with a trail of ignored problems.
The practical translation: advisories are a free, specific, professional set of recommendations from the only person who has put the vehicle on a ramp in the last year. Ignoring them is technically legal and commercially stupid, because the same tester will likely fail the same part next time. Most fleet managers treat the advisory list as a shopping list for the six-month service, not as decoration on the certificate.
A typical van MOT advisory list might read: "Front brake pad(s) wearing thin (1.1.13 (a) (ii))". "Nearside front tyre worn close to legal limit (5.2.3 (e))". "Offside rear shock absorber has slight fluid leak but condition is acceptable (5.3.2 (b) (i))". Read each one on its own, not as a block. The brake pads will fail next time. The tyre has maybe 5,000 miles left. The shock will likely be fine for another 12 months. Three different response times.
How to triage an MOT advisory list
The trap with advisories is that they all look equally important on the paperwork. They are not. A mental three-tier triage, applied to the list on the day you collect the vehicle, separates the urgent from the routine.
Tier 1: fix within two weeks. Anything brake-related (pads, discs, fluid). Anything steering or suspension with the word "leak", "play", or "excessive". Anything involving a tyre near 2mm. Safety-critical wear does not slow down because the MOT gave it a pass this year.
Tier 2: fix at the next service. Items wearing towards the limit but not there yet. A shock absorber with "slight fluid leak but condition acceptable", a wiper blade on its way out, a handbrake slightly less effective than last year. Roll these into the next scheduled service so you are not paying two lots of labour.
Tier 3: monitor. Slight corrosion with no structural concern, cosmetic items, mounts and brackets flagged for future attention. These go on the vehicle file. Check at every service; fix when they move up a tier.
A fleet that runs this triage for 12 months and records the disposition of each advisory tends to pass its next MOT cleanly, because Tier 1 and Tier 2 items are closed out by the service schedule rather than surfacing as fails.
What happens if I drive with a dangerous defect?
Driving a vehicle with a dangerous defect on the road is an offence. It does not matter that the vehicle passed MOT 11 months ago, or that the current MOT result note is waiting in the inbox, or that you are only driving to the nearest garage. The moment the tester records the defect as dangerous, that vehicle is off the road until it is fixed, either by repair on the forecourt or by recovery to a workshop.
The fixed penalty can sit at £2,500 and 3 penalty points for driving a vehicle in a dangerous condition under the Road Traffic Act 1988. If the dangerous defect is a tyre below the legal limit or damaged, the fine is per tyre; four dangerous tyres is a £10,000 exposure and a ban. The vehicle's insurance cover may also be voided because a dangerous defect breaches the duty to keep the vehicle roadworthy.
The split between major and dangerous matters because it changes what you do in the five minutes after the tester hands over the result. A major failure lets you drive to a garage for repair, within the remaining validity of the previous MOT. A dangerous failure grounds the vehicle where it is.
What's the difference between a minor defect and an advisory?
A minor defect is a real fault that the law accepts but would rather see fixed, recorded formally on the certificate. An advisory is a professional warning about a part that is not yet faulty but is wearing. Both go on the gov.uk record, but only the minor defect is a codified breach of the roadworthiness standard.
In day-to-day terms the distinction shows up at resale. A used buyer who knows to look will pull the free MOT history on gov.uk and read every minor and advisory ever recorded. A pattern of minors that never get fixed is a louder signal than a single dangerous failure that was repaired and retested the same afternoon.
If you are buying a used van or HGV for the fleet, the MOT history is the best free due-diligence tool in the UK. An advisory from two years ago that appears again this year is a part that has been wearing, slowly, without anyone fixing it. A minor defect that repeats over three MOTs is a part that keeps failing safely, which is another way of saying the vehicle is being kept legal but not healthy.
What do I do about an advisory that keeps appearing?
The honest answer is: fix it, or plan to sell the vehicle before it becomes a major fail. Repeat advisories on the same component are the clearest signal that a part is on a wear curve the tester thinks will end in a fail within one more MOT cycle. Sometimes that is fine (corrosion on a non-load-bearing panel is tracked, not fixed, on a 10-year-old workhorse). Most of the time it is not.
Keep the advisory list per vehicle and compare it across MOTs. If a pad thickness note appears in 2024 and again in 2025, you are probably driving on the pads that will fail the 2026 test. Book the pad change now. Fleet operators who run this cross-MOT comparison at the annual inspection plan their own maintenance 12 months ahead and almost never see a surprise fail.
The clean way to hold this data is the vehicle file itself: every MOT, every service, every defect noted by a driver walkaround. When the history is written up properly, each advisory has three states: open, scheduled, or closed. A single vehicle with a current open advisory is fine. A vehicle with three open advisories from two different MOTs is your next breakdown.
The bottom line
Advisories are not decorative. They are the tester's best professional read on what will fail your next MOT. Triage them the day you collect the vehicle. Fix the brake, steering and tyre items inside two weeks; roll the wear items into the next service; monitor the cosmetic and structural notes. Treat a repeat advisory as a booked job, not a note.
If you are buying a used vehicle, spend five minutes on the free MOT history before you spend five thousand pounds on the vehicle. Every advisory ever recorded against that plate is in there, and the pattern tells you more than the photos ever will.
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Sources: How the new MOT defect categories will work, DVSA Matters of Testing · Getting an MOT: MOT test result, GOV.UK · MOT changes from May 2018, GOV.UK · Categorisation of Vehicle Defects, DVSA December 2024 · MOT inspection manual: cars and passenger vehicles, GOV.UK · Why we are changing manual advisories, DVSA Matters of Testing