MOT Advisories Explained: The Three-Tier System & When to Actually Worry
Most drivers leave an MOT test not realising they've just been handed a tiered warning system — not a simple pass-or-fail note. Since May 2018, the DVSA has classified every MOT defect into one of three categories: Dangerous, Major, or Minor. MOT advisories sit alongside this system as a separate fourth category, and here's the part most garages won't tell you: they carry no legal obligation to fix before your next test. Understanding this single distinction could save you between £200 and £500 a year. This guide breaks down exactly what each tier means, which advisories are genuinely urgent, and how to check your MOT history to spot patterns over time.
The Three-Tier MOT Defect System Introduced in 2018
Before May 2018, MOT results were binary: pass or fail. The DVSA reformed the system to introduce three distinct defect categories, giving drivers far more actionable information.
- Dangerous: An immediate risk to road safety or the environment. The vehicle must not be driven until repaired. Driving it on a public road is a criminal offence, even if it held a valid MOT certificate the day before.
- Major: A significant defect that affects safety or emissions. This causes an MOT failure. The vehicle cannot be driven until the fault is fixed and a retest passed.
- Minor: A defect with no significant effect on safety or the environment. The car passes its MOT. There is no legal requirement to repair a Minor defect before the next test.
Advisories are a fourth, separate category sitting alongside these three tiers. They record components that are worn or deteriorating but have not yet reached even the Minor defect threshold. The car passes. No repair is legally required.
What Counts as a Minor Advisory — and What Doesn't
Advisories are the most frequently recorded MOT outcome for UK drivers. Common examples include:
- Tyre tread worn but still above the legal 1.6mm minimum
- Brake pads approaching — but not at — the wear limit
- Minor corrosion on brake discs or body panels
- A wiper blade leaving a slight smear
- Minor play in a steering or suspension component
None of these legally require repair before your next MOT. That said, some are worth addressing sooner rather than later. Tyre tread near the limit degrades your stopping distance in wet conditions long before it crosses the legal threshold. The advisory doesn't mean ignore it — it means you have time to make an informed decision rather than being pressured into same-day repairs at inflated prices.
Use Autodun's AI car assistant if you're unsure whether a specific advisory on your certificate warrants prompt attention.
How Garages Exploit the Advisory System — and How to Spot It
Here's the thing — the language garages use around advisories often blurs the line between a legal requirement and a commercial recommendation. Watch out for phrases like "this needs doing urgently" or "we'd strongly advise fixing this today" attached to items that are advisory-level only.
The realistic repair costs for common advisories in the UK:
| Advisory Type | Typical Cost (Independent Garage) | Urgency |
|---|---|---|
| Wiper blade replacement | £10–£30 fitted | Low |
| Brake pad replacement (per axle) | £80–£180 | Medium–High |
| Tyre replacement (per tyre, mid-range) | £70–£130 fitted | High if near 1.6mm |
| Track rod end replacement | £100–£200 | Medium |
If a garage quotes significantly above these ranges for advisory repairs immediately after your MOT, get a second quote. Dealerships in particular mark up labour rates by 30–60% compared to independent garages. The advisory gives you time — use it to shop around.
MOT Advisory vs MOT Failure: The Practical Difference
A Major or Dangerous defect means your MOT certificate is not issued. You cannot legally drive the vehicle on a public road — except directly to a pre-booked repair appointment, and only if the defect is not Dangerous. An advisory, by contrast, does not affect your certificate at all. Your MOT passes. The car is legal to drive.
| Factor | Advisory | Minor Defect | Major / Dangerous |
|---|---|---|---|
| MOT certificate issued? | Yes | Yes | No |
| Legal to drive? | Yes | Yes | No (Dangerous) / No without retest (Major) |
| Repair required by law? | No | No | Yes, before driving |
| Stays on DVSA record? | Yes, permanently | Yes, permanently | Yes, permanently |
What often gets overlooked is that advisory items are recorded on your vehicle's MOT history and are visible to anyone who checks it. If the same advisory appears across two or three consecutive MOTs without being addressed, it signals to future buyers — and insurers — that the car has been poorly maintained. Repeated advisories can affect a private sale price, sometimes significantly.
You can view the full advisory history for any UK vehicle by entering its registration at the official GOV.UK MOT check service, or by using the free Autodun MOT history tool for a clearer timeline view.
Should You Buy a Car With MOT Advisories?
The short answer is: it depends entirely on what the advisories are and how many consecutive tests they've appeared on. A single advisory for minor tyre wear on an otherwise clean history is trivial. Three consecutive advisories for suspension play or brake corrosion on a high-mileage car tells a different story.
Before buying any used car, always pull its full MOT history. Look for:
- Advisories that have escalated from advisory to Major over successive tests — this signals a deteriorating component
- The same advisory repeated across multiple years without repair
- Any previous Dangerous defects in recent history
Practically speaking, use advisories as a negotiating tool. A legitimate advisory for worn brake pads represents a quantifiable future cost — typically £80–£180. You're entitled to factor that into your offer price. Don't pay full market value for a car with £400–£600 of deferred maintenance sitting in its advisory history.
What the Official Guidance Says
The DVSA publishes its full MOT testing guide at gov.uk/guidance/mot-testing-guide, which defines the three defect categories and the obligations attached to each. The official MOT check service — including full advisory history — is available free at gov.uk/check-mot-history. Both are published by the Driver and Vehicle Standards Agency.
For the current maximum MOT test fee for a Class 4 vehicle (standard car), the DVSA-set cap is £54.85 — garages may charge less but cannot legally charge more. Always verify current figures directly at gov.uk/getting-an-mot/mot-test-fees.
Frequently Asked Questions
Do I have to fix MOT advisories before driving away?
No — not if they are advisories. An advisory means your car has passed its MOT and is legal to drive. There's no legal obligation to repair advisory items before your next test. Dangerous defects are different: those mean the car must not be driven on a public road at all until the fault is corrected. Always check your certificate to confirm which category any recorded defect falls into.
How long do MOT advisories stay on the record?
MOT advisories are permanently attached to the vehicle's test record — not a rolling window. Anyone checking the car's MOT history through GOV.UK or a history check service will see every advisory ever recorded, going back to when digital records began. This is why repeated advisories on the same component across multiple tests can reduce a used car's value — they demonstrate a pattern of deferred maintenance.
Can an advisory become a failure at the next MOT?
Yes, and this is exactly how the system is designed to work. An advisory recorded this year may deteriorate into a Major defect — an MOT failure — by the following year's test. Brake pads noted as wearing thin are a classic example. Ignoring it doesn't just risk a failed MOT; it may compromise safety and result in a significantly higher repair bill once the component fails entirely.
How do I check what advisories my car has?
Enter your registration number at the official GOV.UK MOT check service at gov.uk/check-mot-history to view all pass, fail, and advisory records. You'll see the exact wording used by the tester, the date of each test, and the mileage recorded. For a clearer timeline view, the free Autodun MOT predictor presents the same DVSA data and can flag patterns across multiple tests.
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Check your MOT history and advisory record free → Free MOT failure risk predictor → Get instant AI car advice on any advisory → Find your perfect electric car →Editorial note: This article was researched using official DVSA and GOV.UK sources. All regulatory claims reflect current UK law as of June 2026. MOT rules and fees are subject to change — always verify at GOV.UK. Autodun is not a government service and does not replace DVSA advice or certified inspections.
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